07-15-2015, 11:48 AM | #1 |
Private First Class
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Brake issue in hot weather
During a heat spell in the last week of June (the temperature was above 30*C / 86*F) my brake pedal started to sink under constant pressure and need to be depressed further and further to maintain the same braking force.
A few times at a stop, I'd be holding the brake pedal constantly and the car would start rolling forward again until I pressed the brakes further, all the way until it was about 1 inch off the floor. I haven't read about any issues like this concerning F25s, but all other forums seem to point to a faulty master cylinder. I took the car in to the shop a couple days ago, but with it being a relatively cool day, they weren't able to replicate the issue and the diagnostics ended there (after also checking for fault codes). There's a lot of you in much warmer climates than here in Calgary... Anyone else experienced this issue? I feel like the dealership could/should have been more proactive, but I'm a bit at a loss as to what else they could do. Thoughts? |
07-15-2015, 12:19 PM | #2 |
Captain
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No problems here in inland So. California.
Last time you had a brake bleed....brake fluid is hydrophilic. Somewhere off the internet...."Because brake fluid is well known as a hygroscopic fluid, its molecular O-H structure easily allows hydrogen bonding with hydromolecules, e.g., H2O. The moist brake fluid reduces the boiling point and moreover causes the deterioration of the functionality of the brake system." |
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07-15-2015, 12:28 PM | #3 | |
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Drives: 2020 BMW X3 M
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Location: Northbrook, Illinois
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