Skip the auto shop - Our mechanics make house calls

Q: Brake booster heat issue.

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.

A: Hello and thank you for your question. The...

Hello and thank you for your question. There could be an issue with the proportioning valve or ABS module. I suggest flushing out all of the brake fluid and bleeding all ports on the brake system. When replacing all of the parts, there could be a restriction or particles that could plug up the valves. It is important to bleed out a caliper to put on new pads rather than using a c-clamp to push the piston back in. There could be debris on the piston and then the debris can be forced into the proportioning valve causing it to stick. If you need assistance with troubleshooting the brake system, then seek out a professional, preferably a Your Mechanic professional to help you with your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Brakes not working at all - 1999 Jeep Wrangler

If your master cylinder is not losing fluid and you tried bleeding the system then your master cylinder is bad. The internal rubber cups got damaged when you allowed the pedal to go to the floor the first time. You...

Q: Heater not working - 2002 Chevrolet S10

Hi there. It sounds like you may have a blend door motor failure. The blend door motor moves the blend door inside the HVAC case to literally blend the air temperature out of the vents by directing the airflow accordingly...

Q: Water damage caused car not to start

If you went through water and your engine ingested the water and stalled, then you would have to have all the spark plugs removed and the intake cleaned out. The engine would need to be turned over with the spark...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.