Skip the auto shop - Our mechanics make house calls

Q: Brake booster has oil in it. Engine oil.

asked by on

I have pulled the mechanical vacuum pump out and there was oil coming out of the vacuum outlet. I guessing that it has an internal leak that has backed oil into the booster by a bad check valve. I have replaced all lines to the booster as well as the check valve, break booster and manual vacuum pump on the motor. Is there any other source that could leak oil into that system? The oil is definitely engine oil. So I assumed this would be the only source. There is a small plastic manifold before the vacuum booster and oil was there also. So I have replaced all parts. Should this fix the problems? When booster stopped working right the waste gate on turbo was not either. I'm assuming that the vacuum was effected there by the issues with oil in lines. Should I also replace those lines to turbo waste gate? Thanks for any advice..

My car has 46000 miles.
My car has an automatic transmission.

A: The vacuum pump was the source of the oil i...

The vacuum pump was the source of the oil in all probability. Also, check the wastegate vacuum lines for any signs of oil. If there’s any question then I’d suggest replacing them too.

If you’d like a fresh set of eyes on this, consider YourMechanic, as a certified professional can come to you and pinpoint any leaks to give you some peace of mind.

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: No spark from the ignition coil

Unfortunately the information provided on your Ford Thunderbird is very limited and it will be difficult to provide a diagnosis at this time. There is not a direct question provided, however I can assume that your vehicle is experiencing fuel...

Q: How do I turn on the ambient lighting?

In your truck, there is Ambient Lighting that helps illuminate the cab of your truck at the cup holders and footwells without distracting you while driving. To turn on the Ambient Lighting. Press the right side of the Ambient...

Q: Car idles, surges, then lowers, and then dies

Hello. It sounds like there may be a loose or disconnected vacuum hose. The upper or lower intake gasket could be leaking as well. There is also a possibility that the mass airflow (MAF) sensor, idle air control valve, or...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.