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: Q: Heater broken

Hi. When a heater core fails, it usually fails by leaking coolant into the passenger compartment in the vehicle. If your problem is that hot air is not being blown out of your vents, you could have several other issues....

Q: Getting error code P0673

Taking your car on a road trip should be fine. This code that you are getting is for a glow plug issue. These are typically only used to warm the car up before starting it. Once you get back you...

Q: Car wobbles

Hi, check the rim and see if it is damaged at all. You may have hit the rim and the body of the car will be fine. The wheel however is misaligned, especially if the steering wheel is wobbling a...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.