What makes brakes stop working when it's hot outside?

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  • MrMaxwell
    Too lazy to set a custom title
    • Jul 2005
    • 10057
    #1

    What makes brakes stop working when it's hot outside?

    When it's between 95-110F outside my brakes go almost completely out... like they are almost all the way to the floor.... I don't think it's the booster, because if it was I'd still have regular not power brakes, right?

    Someone told me it could be the master cylinder ... I'm thinking maybe I'm getting some air in the lines .. Or maybe the fluid is old and boiling momentarily.... anyone know what might cause this?

    Now the brake pedal goes a lot farther down than it should even when it's cool outside......

    It's a 1993 accord
    Tags: None
    • dyna mo
      just a fucking jerk
      • Dec 2008
      • 68184
      #2
      low fluid for sure, either due to water, air, etc. certainly start at the master cylinder.

        Comment

        • Google Expert
          Webmaster
          • Jun 2004
          • 14294
          #3
          maybe it's time to replace the break pads

            Comment

            • Colmike9
              (>^_^)b
              • Dec 2011
              • 7230
              #4
              Could be a lot of things like a bad caliper/s, heat expanding something allowing air in the lines, leak in MC, check if paint is missing from the car body since brake fluid leaks strip paint, brakes might need bleeding, etc.
              I'd have a mechanic look at it.
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              I make a lot more money in the medical field in a lab now, fuck you guys. Don't ask me to come back, but do join Chaturbate in my sig, it still makes bank without me touching shit for years..

                Comment

                • MrMaxwell
                  Too lazy to set a custom title
                  • Jul 2005
                  • 10057
                  #5
                  The pads and rotors are new..
                  I added some fluid, it wasn't very low though... how do you get air out of it? Take the lid off and pump the brakes? Or do you have to actually bleed the whole thing???

                    Comment

                    • MediumPimpin
                      Confirmed User
                      • Apr 2003
                      • 1488
                      #6
                      Two things, it sounds like you have water in the lines, which when hot will cause a soft pedal feel.

                      And if it is that then you have a leak, more then likely in the master cylinder.
                      nats.mediumpimpin.com

                        Comment

                        • Vendzilla
                          Biker Gnome
                          • Mar 2004
                          • 23200
                          #7
                          If the fluid is low, means you might have a slow leak. They have to be purged of air bubbles. Since you have new pads and rotors, master cylinder and lines , calipers and wheel cylinders are left. I would bleed the brake lines first
                          Carbon is not the problem, it makes up 0.041% of our atmosphere , 95% of that is from Volcanos and decomposing plants and stuff. So people in the US are responsible for 13% of the carbon in the atmosphere which 95% is not from Humans, like cars and trucks and stuff and they want to spend trillions to fix it while Solar Panel plants are powered by coal plants
                          think about that

                            Comment

                            • PillWealth
                              Registered User
                              • Sep 2012
                              • 46
                              #8
                              I would definetly get professional assistance when working on something like your brakes. But if you feel comfortable working on them, bleeding is fairly simple, but it takes 2 people. You have one guy undo the break line as you press it down, then he tights it back up, while your still holding it down. When tight, you let off and repeat.

                              Popular Mechanics has a how-to on this subject.
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                                Comment

                                • dyna mo
                                  just a fucking jerk
                                  • Dec 2008
                                  • 68184
                                  #9
                                  it can be a weak line that expands when you pump the pedal, if the pedal goes all the way to the floor you can pretty much rule that out though. but if it only happens when hot then you have a leak and something got in the system that reacts to heat more than hydraulic fluid, again, prolly water.
                                  you'll have to bleed the brakes if so, no biggie.

                                  you can *maybe* pump the brakes with the master cylinder cover off to see if any water rises to the top, then it can evaporate.

                                  don't smash the pedal when you do that, you'll blow all the fluid out the top of the master. slowly.....

                                  you can feel each hydraulic line going to each wheel to see if it's a weak link.

                                    Comment

                                    • sarettah
                                      see you later, I'm gone
                                      • Oct 2002
                                      • 14293
                                      #10
                                      Originally posted by MrMaxwell
                                      When it's between 95-110F outside my brakes go almost completely out... like they are almost all the way to the floor.... I don't think it's the booster, because if it was I'd still have regular not power brakes, right?

                                      Someone told me it could be the master cylinder ... I'm thinking maybe I'm getting some air in the lines .. Or maybe the fluid is old and boiling momentarily.... anyone know what might cause this?

                                      Now the brake pedal goes a lot farther down than it should even when it's cool outside......

                                      It's a 1993 accord
                                      Isn't it your employer's car?

                                      If not, then it is probably related to the breathalyzer lock thing you had installed

                                      ;p

                                      .
                                      All cookies cleared!

                                        Comment

                                        • dyna mo
                                          just a fucking jerk
                                          • Dec 2008
                                          • 68184
                                          #11
                                          Originally posted by sarettah
                                          Isn't it your employer's car?

                                          If not, then it is probably related to the breathalyzer lock thing you had installed

                                          ;p

                                          .

                                            Comment

                                            • L-Pink
                                              working on my tan
                                              • Mar 2005
                                              • 39151
                                              #12
                                              Originally posted by sarettah
                                              Isn't it your employer's car?

                                              If not, then it is probably related to the breathalyzer lock thing you had installed

                                              ;p

                                              .




                                              .

                                                Comment

                                                • dyna mo
                                                  just a fucking jerk
                                                  • Dec 2008
                                                  • 68184
                                                  #13
                                                  you know it's about as funny as it can get when all L-pink can do is giggle!

                                                  hahahahahah

                                                    Comment

                                                    • L-Pink
                                                      working on my tan
                                                      • Mar 2005
                                                      • 39151
                                                      #14
                                                      Originally posted by dyna mo
                                                      you know it's about as funny as it can get when all L-pink can do is giggle!

                                                      hahahahahah
                                                      I was going to give a serious answer until I saw the post and was reminded he shouldn't be driving at all.

                                                      Anyway, On real hot days, less heat is able to escape from under the hood. Extra heat in the master cylinder can cause the internal bore to slightly expand. If the cup seal inside the bore is worn the bore expands from the heat and the seal starts to allow the brake fluid to by-pass it and the brakes become softer than that big spot on JohnnyClips head.


                                                      .

                                                        Comment

                                                        • fobert
                                                          Confirmed User
                                                          • Feb 2010
                                                          • 254
                                                          #15
                                                          brake fluid boiling and/or friction lost between pad/rotor due to excessive heat. completely flushing and refilling your braking system with new fluid will help immensely. some aftermarket pads and rotors are made to withstand heat a bit better, and though completely unnecessary for a street car, stainless steel lines have been shown to help with pedal feel and travel.

                                                            Comment

                                                            • tobe87
                                                              Cougar Hunter
                                                              • Mar 2011
                                                              • 396
                                                              #16
                                                              I wouldn't be driving that shit around town. Bleed all of your lines. If it happens again I'd start looking 4 leaks in the lines or cracks in the master cylinder.
                                                              [email protected]
                                                              Skype - kalyn.sanders

                                                                Comment

                                                                • brassmonkey
                                                                  Pay It Forward
                                                                  • Sep 2005
                                                                  • 77396
                                                                  #17
                                                                  i never take brakes my wife beats me help
                                                                  TRUMP 2026 KEKAW!!! - The Laken Riley Act Is Law!
                                                                  DACA ENDED - SUPPORT AZ HCR 2060 52R - email: brassballz-at-techie.com

                                                                    Comment

                                                                    • bean-aid
                                                                      So Fucking Banned
                                                                      • Jun 2011
                                                                      • 16493
                                                                      #18
                                                                      I would consult with your lawnmower.

                                                                        Comment

                                                                        • L-Pink
                                                                          working on my tan
                                                                          • Mar 2005
                                                                          • 39151
                                                                          #19
                                                                          Conversation around 2am tomorrow somewhere in Kansas:

                                                                          "Officer I didn't wreck because I'm drunk again. I wrecked because my brakes don't work. If you don't believe me go fuck yourself and look for my post"


                                                                          .

                                                                            Comment

                                                                            • dyna mo
                                                                              just a fucking jerk
                                                                              • Dec 2008
                                                                              • 68184
                                                                              #20
                                                                              Originally posted by L-Pink
                                                                              I was going to give a serious answer until I saw the post and was reminded he shouldn't be driving at all.

                                                                              Anyway, On real hot days, less heat is able to escape from under the hood. Extra heat in the master cylinder can cause the internal bore to slightly expand. If the cup seal inside the bore is worn the bore expands from the heat and the seal starts to allow the brake fluid to by-pass it and the brakes become softer than that big spot on JohnnyClips head.


                                                                              .

                                                                              oh yah huh. the seal can detoriate if there's consistently low brake fluid right?

                                                                                Comment

                                                                                • L-Pink
                                                                                  working on my tan
                                                                                  • Mar 2005
                                                                                  • 39151
                                                                                  #21
                                                                                  Originally posted by dyna mo
                                                                                  oh yah huh. the seal can detoriate if there's consistently low brake fluid right?
                                                                                  And probably being original on a car that qualifies for antique license plates.


                                                                                  .

                                                                                    Comment

                                                                                    • sarettah
                                                                                      see you later, I'm gone
                                                                                      • Oct 2002
                                                                                      • 14293
                                                                                      #22
                                                                                      Originally posted by L-Pink
                                                                                      Anyway, On real hot days, less heat is able to escape from under the hood. Extra heat in the master cylinder can cause the internal bore to slightly expand. If the cup seal inside the bore is worn the bore expands from the heat and the seal starts to allow the brake fluid to by-pass it and the brakes become softer than that big spot on JohnnyClips head.
                                                                                      .

                                                                                      I am impressed


                                                                                      btw, see sig.

                                                                                      ;p

                                                                                      .
                                                                                      All cookies cleared!

                                                                                        Comment

                                                                                        • L-Pink
                                                                                          working on my tan
                                                                                          • Mar 2005
                                                                                          • 39151
                                                                                          #23
                                                                                          Originally posted by sarettah
                                                                                          I am impressed


                                                                                          btw, see sig.

                                                                                          ;p

                                                                                          .
                                                                                          In a previous life I operated then sold my tire/auto repair stores to Sears. Now I don't even fill my own windshield washer reservoir.


                                                                                          .

                                                                                            Comment

                                                                                            • MrMaxwell
                                                                                              Too lazy to set a custom title
                                                                                              • Jul 2005
                                                                                              • 10057
                                                                                              #24
                                                                                              Thanks for the comedy and the good ideas

                                                                                                Comment

                                                                                                • brassmonkey
                                                                                                  Pay It Forward
                                                                                                  • Sep 2005
                                                                                                  • 77396
                                                                                                  #25
                                                                                                  fuck you assholes i was crying 4 help
                                                                                                  TRUMP 2026 KEKAW!!! - The Laken Riley Act Is Law!
                                                                                                  DACA ENDED - SUPPORT AZ HCR 2060 52R - email: brassballz-at-techie.com

                                                                                                    Comment

                                                                                                    • Spunky
                                                                                                      I need a beer
                                                                                                      • Jun 2002
                                                                                                      • 133986
                                                                                                      #26
                                                                                                      It means you will die in a horrible rear ender and the estate gets sued unless you take the car to a brake specialist and not GFY

                                                                                                        Comment

                                                                                                        • globofun
                                                                                                          Buk Lau
                                                                                                          • Aug 2005
                                                                                                          • 2651
                                                                                                          #27
                                                                                                          Wow! This thread delivers....is this for real?????

                                                                                                          Rippley's believe it or not!
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                                                                                                            • blackmonsters
                                                                                                              Making PHP work
                                                                                                              • Nov 2002
                                                                                                              • 20961
                                                                                                              #28
                                                                                                              Originally posted by sarettah
                                                                                                              Isn't it your employer's car?

                                                                                                              If not, then it is probably related to the breathalyzer lock thing you had installed

                                                                                                              ;p

                                                                                                              .









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                                                                                                                Comment

                                                                                                                • AllAboutCams
                                                                                                                  Femcams.com
                                                                                                                  • Jul 2011
                                                                                                                  • 12234
                                                                                                                  #29
                                                                                                                  how can you drive if you have a dui?
                                                                                                                  Binance - Blockchain and Crypto Asset Exchange
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                                                                                                                    Comment

                                                                                                                    • Manfap
                                                                                                                      Confirmed User
                                                                                                                      • Jan 2013
                                                                                                                      • 2626
                                                                                                                      #30
                                                                                                                      shit car maybe?

                                                                                                                        Comment

                                                                                                                        • georgeyw
                                                                                                                          58008 53773
                                                                                                                          • Jul 2005
                                                                                                                          • 9865
                                                                                                                          #31
                                                                                                                          Originally posted by L-Pink
                                                                                                                          I was going to give a serious answer until I saw the post and was reminded he shouldn't be driving at all.

                                                                                                                          Anyway, On real hot days, less heat is able to escape from under the hood. Extra heat in the master cylinder can cause the internal bore to slightly expand. If the cup seal inside the bore is worn the bore expands from the heat and the seal starts to allow the brake fluid to by-pass it and the brakes become softer than that big spot on JohnnyClips head.


                                                                                                                          .


                                                                                                                          '93 Accord is old old old and as L-Pink has mentioned, if the master is original still, then there is a very good chance that it is the problem. ESPECIALLY if you find your foot hitting the firewall when you brake on hot days.

                                                                                                                          Just had a quick look on ebay and an accord m/c is cheap as over there $50 or there abouts, for the price, i'd just replace the thing.
                                                                                                                          TripleXPrint on Megan Fox
                                                                                                                          "I would STILL suck her pussy until her face caved in. And then blow her up and do it again!"

                                                                                                                            Comment

                                                                                                                            • marlboroack
                                                                                                                              So Fucking Banned
                                                                                                                              • Jul 2010
                                                                                                                              • 9327
                                                                                                                              #32
                                                                                                                              You have to keep in mind 1993 models are already 20 years old.

                                                                                                                                Comment

                                                                                                                                • SilentKnight
                                                                                                                                  Megan Fox's fluffer
                                                                                                                                  • Oct 2005
                                                                                                                                  • 24818
                                                                                                                                  #33
                                                                                                                                  Originally posted by L-Pink
                                                                                                                                  And probably being original on a car that qualifies for antique license plates.


                                                                                                                                  .
                                                                                                                                  Around here we call'em "bingo cars" - used by white trash, chronic welfare bums to shuttle back and forth to the bingo hall.

                                                                                                                                  Easily identifiable by all the stupid and banal bumper stickers, empty Big Gulp cups on the dash, and troll dolls dangling from the rearview mirror.

                                                                                                                                    Comment

                                                                                                                                    • MrMaxwell
                                                                                                                                      Too lazy to set a custom title
                                                                                                                                      • Jul 2005
                                                                                                                                      • 10057
                                                                                                                                      #34
                                                                                                                                      I don't have any bumper stickers or big gulp cups and I haven't played bingo in years




                                                                                                                                      Pumping the brakes with the cap off of the reservoir doesn't do anything.. the fluid barely moves, no air bubbles ...even if I jam down on the pedal.. I am pretty sure the master cylinder must be about shot.

                                                                                                                                        Comment

                                                                                                                                        • CurrentlySober
                                                                                                                                          Too lazy to wipe my ass
                                                                                                                                          • Aug 2002
                                                                                                                                          • 38940
                                                                                                                                          #35
                                                                                                                                          Originally posted by Manfap
                                                                                                                                          shit car maybe?
                                                                                                                                          i enjoy shitting in my car...


                                                                                                                                          👁️ 👍️ 💩

                                                                                                                                            Comment

                                                                                                                                            • ajrocks
                                                                                                                                              Confirmed User
                                                                                                                                              • Nov 2004
                                                                                                                                              • 4526
                                                                                                                                              #36
                                                                                                                                              What causes breaks to stop working when it's hot outside is likely the heat.
                                                                                                                                              SEO Strategy - Digital Strategy - Cannabis Lead Generation

                                                                                                                                              Skype aj.durden1

                                                                                                                                                Comment

                                                                                                                                                • MrMaxwell
                                                                                                                                                  Too lazy to set a custom title
                                                                                                                                                  • Jul 2005
                                                                                                                                                  • 10057
                                                                                                                                                  #37
                                                                                                                                                  Well the pedal just goes pretty far down all of the time, even at night, now.. I'm pretty sure it has to be the master cylinder. With the car running- jamming the pedal down hard should make fluid gush out of the reservoir? It definitely didn't. . .

                                                                                                                                                  I'll bleed the system first and get it up in the air and look for leaks, first.

                                                                                                                                                  This guy I know will slop a used one on there for me for $20, too
                                                                                                                                                  It's from a low mileage car but will it be any good? I would think the seals and diaphragm or whatever else in there would be shot...

                                                                                                                                                  Are these difficult to disassemble? It seems stupid to slop a whole new one on there when it probably just needs a seal or whatever else.

                                                                                                                                                    Comment

                                                                                                                                                    • MrMaxwell
                                                                                                                                                      Too lazy to set a custom title
                                                                                                                                                      • Jul 2005
                                                                                                                                                      • 10057
                                                                                                                                                      #38
                                                                                                                                                      PS: No one I ask seems to have a clear answer for this... My thinking is that if this were caused by the booster, I'd only lose power brakes, and I'd have a hard pedal / manual braking ... right?

                                                                                                                                                        Comment

                                                                                                                                                        • MrMaxwell
                                                                                                                                                          Too lazy to set a custom title
                                                                                                                                                          • Jul 2005
                                                                                                                                                          • 10057
                                                                                                                                                          #39
                                                                                                                                                          I knew I wasn't imagining that shit
                                                                                                                                                          http://www.hondaaccordforum.com/foru...es-floor-4261/

                                                                                                                                                          NOW......... If the brake pedal GOES TO FLOOR INTERMITTENTLY ..............You need to replace the BRAKE MASTER CYLINDER .......it leaks internally and you will not see any fluid drop anywhere and fluid will not get low ........

                                                                                                                                                          IF it has an internal leak and when a shop looks at it they cannot find any leaks,, it will act up worse on HOT days and during the hottest part of the day,,,,,,,,,it might work ok in the early mornings and in the evenings,,,,,,,,,,
                                                                                                                                                          It is very very dangerous the way it is, because if you were to need to make a panic stop and there is nothing there, you could get in an accident hurting yourself, your loved ones or other people in different car or pedestrians ..

                                                                                                                                                            Comment

                                                                                                                                                            • Si
                                                                                                                                                              Such Fun!
                                                                                                                                                              • Feb 2008
                                                                                                                                                              • 13900
                                                                                                                                                              #40
                                                                                                                                                              So your brakes are not working? Sorry, I cut the lines!

                                                                                                                                                                Comment

                                                                                                                                                                • MrMaxwell
                                                                                                                                                                  Too lazy to set a custom title
                                                                                                                                                                  • Jul 2005
                                                                                                                                                                  • 10057
                                                                                                                                                                  #41
                                                                                                                                                                  You cut the lines, eh?
                                                                                                                                                                  And my car is too old, and it's a lowlife type of vehicle, etc etc

                                                                                                                                                                  You all talk like you've never been poor, before.
                                                                                                                                                                  Everyone is just a billionaire.. heh :P

                                                                                                                                                                  For the record, I was never a dick to poor people when ever I have had a little money. I'm not sure what people get out of looking to insult or belittle others, but I think it's a waste of time.

                                                                                                                                                                  Okay, I am down, I have been down for a long time, ha ha ha ... real funny .. I've never taken $1 from the government and I've half supported several of my loved ones who were supposed to be elders..

                                                                                                                                                                  Hard times, all that,

                                                                                                                                                                  At least I am trying now
                                                                                                                                                                  Relax with the insults- they don't bother me
                                                                                                                                                                  The funny ones though, I love those, good work on those :D

                                                                                                                                                                    Comment

                                                                                                                                                                    • Captain Kawaii
                                                                                                                                                                      So Fucking Banned
                                                                                                                                                                      • Oct 2007
                                                                                                                                                                      • 6748
                                                                                                                                                                      #42
                                                                                                                                                                      Originally posted by sarettah
                                                                                                                                                                      Isn't it your employer's car?

                                                                                                                                                                      If not, then it is probably related to the breathalyzer lock thing you had installed

                                                                                                                                                                      ;p

                                                                                                                                                                      .
                                                                                                                                                                      - I was going to just say, "alcohol."

                                                                                                                                                                        Comment

                                                                                                                                                                        • MrMaxwell
                                                                                                                                                                          Too lazy to set a custom title
                                                                                                                                                                          • Jul 2005
                                                                                                                                                                          • 10057
                                                                                                                                                                          #43
                                                                                                                                                                          As I have said 1000 times-

                                                                                                                                                                          I am always the first one to leave my car and walk if I have been drinking. I have put complete strangers into a cab to keep them from driving. I don't condone drunk driving. I wasn't drunk when I was charged with DUI.


                                                                                                                                                                          Some things are only funny until they happen to you

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