Skip the auto shop - Our mechanics make house calls

Q: Brake locking - 1990 BMW 750iL

asked by on

I have major problem with the brakes on my car which get locked up when applied. I tried to troubleshoot the issue by replacing the brake pads, rotors, front calipers and hoses but this hasn't helped at all. What else might help?

Your vehicle uses a high-pressure hydraulic brake booster. It’s likely that the pressure regulator sensors that provide the braking assistance are not functioning correctly, providing too much "braking assistance". A professional mechanic, like YourMechanic, can assist with diagnosis of your braking system, and make the necessary repairs.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Stalling at cold start, runs fine when warm

Diesels are in fact notorious for being cold blooded by nature and can be even worse on cold starts. This is mainly due to the manner in which diesel fuel is ignited vs regular gasoline. Diesel fuel has a much...

Q: Cant release rear brake piston so that caliper goes back on

If your vehicle has rear calipers that have the parking brake cable attached to them then you need to use a caliper tool that presses the piston in and turns them at the same time. They will need to be...

Q: Warning light still on

I am not sure that there is actually a problem. The warning indicator that was produced by the vehicle was likely in reaction to the wire being unplugged from the power distribution box. When a trouble code is stored it...

Related articles

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...
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...
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...