Q: Brake booster heat questions again...

asked by on

So I'm having issues with the brakes having a slight drag with heat. Master is a new German replacement. (Second time it's replaced to verify good) booster is new aftermarket. VW added a brake booster heat shield in years after mine and I'm wondering what a brake booster would do if it's getting hot from exhaust and turbo heat. It's not extremely close but my injectors are very worn so I suspect my egt is higher than normal due to overfueling. Pulling the pedal up (unnoticeable amount) causes them to release smooth as glass but it happens again soon. Any ideas would be great. It's all 4 brakes dragging, new soft lines all around, new calipers too. My car has 255000 miles.

My last answer from someone said that it could be caliper debris. When the car is cool the brakes work fine. Cold outside, fine. Brakes drag evenly on all 4 wheels, lifting the pedal releases it. Is there something in a booster that heat can make it slightly engage? Still cant find this out.

My car has 253000 miles.
My car has a manual transmission.

Hi and thanks for your question. The brake booster is vacuum operated and only aids in the stopping force to the driver’s foot pedal. If vacuum pressure drops, then the foot pedal feels very firm, just like stepping on the brakes with the engine off. If you are having to pick up on the pedal and the brakes are fully disengaging, then check the return spring on the brake pedal. It may need to be replaced because it is causing the brake pedal to slightly apply itself with the engine running. The other thing is the brake master cylinder could be defective and causing the pressures to be applied at all times. I recommend checking the return spring on the brake pedal and replacing it if necessary. If you need further assistance, a technician from Your Mechanic can come to your location to inspect and repair your brake issues.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Brake booster heat questions again...

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Lacks power on takeoff 1999 Dodge Ram 1500

Hello - the combination of a lack of power from a standing start, and a poor shifting complaint may indicate your transmission is in "limp mode". This would cause it to take off in 2nd or even 3rd gear -...

Q: Brake lights not working fuse OK bulbs OK new Switch still not working

Hello, thank you for writing in. If you know that the brake bulbs, relay, and switch are good then you have an issue with the wiring or the ground connection. The body control module also plays a role in how...

Q: Q: AC not working.

Hi! There are many possible solutions to your concern. The system is not working is a little vague as there are electrical and mechanical aspects to the air conditioning system. A bug as simple as a blown fuse or low...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.