Skip the auto shop - Our mechanics make house calls

Q: Brakes spongy after booster and master cylinder replacement

asked by on

I had to replace my brake booster and master cylinder. After I got it all back together my brake lights won't turn off unless I disconnect the battery and I can not get the brakes to bleed I am doing it the manual way since I don't have a vacuum bleeder

My car has 169000 miles.
My car has an automatic transmission.

A: Hello. You need to double check the install...

Hello. You need to double check the installation since you may have put the brake booster rod on the brake pedal wrong causing binding of the brake switch and causing the system to not bleed correctly. Also make sure the brake booster to the brake master cylinder push pin is adjusted with the proper clearance. It may be holding the master cylinder partly pressed. If you would like to have expert assistance on this, a certified professional from YourMechanic can come to your car’s location to diagnose the brake symptoms and address the issues properly.

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

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: Number five cylinder problem

The wiring on older Volvos, such as with your 1996 Volvo 960, can be a little temperamental and have bad connections. If the ignition coil is good but the coil itself is not receiving the electrical signal from the computer,...

Q: Car pecking like hen

If you are talking about an engine misfire tick noise then the engine would need to be scanned to see if a misfire code is received. The car should also be checked to see if the coil or spark plug...

Q: Bad misfiring issue - 2004 Nissan 350Z

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...