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Brakes coming on when it gets hot outside.
2011 Buick Regal

Brakes coming on when it gets hot outside.

(2011 Buick Regal)
2011 Buick brake problem
When i leave work from my car sitting in a hot paved parking lot during the day over approx 90 deg outside according to my car temp, all 4 of my brakes are locked on. When i put brake on to take it out of gear they do not release. I drive it down the road for about a mile with steering wheel starting to shake and gas pedal to the floor to a shade tree to cool down. All 4 wheels are very hot to touch and smell of burning brakes. After 5 to 10 minutes of cool down in shade i am good to go. Last year this only happened 3 times when it got to a 100 deg outside. This year much more often at a lower temperature. The dealer and other shops say they never heard of this. I was thinking bad brake rubber hoses but i don't think so and all 4 at the same time? I have checked for an overfull master cylinder, rubber diaphram, and cap vent hole and that is all good. This has me and everyone stumped. Once summer hot weather passes it will work fine.
What seems to make the problem better or worse? Hot outside temperature
How long have you had this problem? 2 yrs
Tags: buick, regal
2 answers & 1 comment
Popular Answer
on July 28, 2019

Leave vehicle with an experienced mechanic until this issue can be diagnosed while the problem is actually present..

I’d be leaning towards a vacuum brake booster malfunction which can be tested ONLY when this concern is in progress by TEMPORARILY removing the vacuum supply ..

Do not attempt this suggested test - This testing ‘must’ be performed by *professional* auto repair personnel !

Good luck!
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on July 29, 2019

This will be testing for critical brake booster ‘return’ to the relaxed or fully released position as the service brake pedal is released.

Have witnessed similar brake booster problems before with various GM vehicles..

However the circumstances of the failure wasn’t necessary contributed to HOT ambient temperatures - - that being said - heat / cold does have the expansion / contraction effect on all elements - which may or may not be a contributing factor.

It simply needs to be happening while an ‘experienced mechanic’ is operating the vehicle - period..

Keep in mind this may take a few days and you should be prepared to leave vehicle at the repair facility UNTIL this can be properly diagnosed .. Some facilities offer loan a car.
General Diagnosis
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on July 28, 2019

Leave vehicle with an experienced mechanic until this issue can be diagnosed while the problem is actually present..

I’d be leaning towards a vacuum brake booster malfunction which can be tested ONLY when this concern is in progress by TEMPORARILY removing the vacuum supply ..

Do not attempt this suggested test - This testing ‘must’ be performed by *professional* auto repair personnel !

Good luck!
Sign in to reply
on July 29, 2019

This will be testing for critical brake booster ‘return’ to the relaxed or fully released position as the service brake pedal is released.

Have witnessed similar brake booster problems before with various GM vehicles..

However the circumstances of the failure wasn’t necessary contributed to HOT ambient temperatures - - that being said - heat / cold does have the expansion / contraction effect on all elements - which may or may not be a contributing factor.

It simply needs to be happening while an ‘experienced mechanic’ is operating the vehicle - period..

Keep in mind this may take a few days and you should be prepared to leave vehicle at the repair facility UNTIL this can be properly diagnosed .. Some facilities offer loan a car.
on July 28, 2019
Hello, this doesn't make a whole lot of rational sense, so I would definitely look at hooking up a diagnostic tool to check chassis related module operation, such as with the antilock brake system. If the system has control problems it could be putting pressure to the brakes at the wheels. Still, this wouldn't be with precedent, and it's all a guess. Hot weather, as a factor, does not influence conventional braking in any way.
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