Skip the auto shop - Our mechanics make house calls

Q: Car would not stop at red light - 2006 BMW 528xi

asked by on

When I started stopping at a red light, I had a frightening thing happen. The car wouldn't slow down! I had to press down on the brake pedal with both feet to get my car to come to a stop. There were no warning signs and no warning lights came on. This problem keeps happening on an intermittent basis. I went to an independent mechanic and he told me that the problem is the brake vacuum pump. Before I have him replace it, would you please give me your diagnosis and solution for my car?

A: Yes, this is a possibility. Due to engine o...

Yes, this is a possibility. Due to engine on this BMW having variable valve lift engine vacuum not always present, a vacuum pump is installed to supply sufficient vacuum to run auxiliary systems such as the brake booster. The vacuum pump system needs to be checked to ensure if sufficient vacuum is being produced by the pump and the system integrity should be checked as well. You may want to enlist the help of a certified mechanic, such as one from YourMechanic, who can check and access the vacuum pump to properly diagnose the brake issue and have this resolved.

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: Brake caliper piston doesn't retract after brake pad replacement.

Hi there. If you cannot retract the caliper pistons when replacing the brake pads then you may have a master cylinder failure that is holding pressure in the braking system. If you have already replaced the pads and put everything...

Q: Engine making a kind of choppy noise

Hi there. One of the negative drawbacks of replacing OEM exhaust systems is the noise you're hearing. This noise is typically caused by small backfires inside the combustion chamber due to the fact that most people don't tune the engine...

Q: AC blows hot in the front, cold in the rear

Hello. It sounds like the blend door actuator is failing. This door is responsible for blocking off air flow to the heater core when the air conditioning is on. I would recommend having the blend door actuator tested using the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.