Skip the auto shop - Our mechanics make house calls

Q: Where is the vacuum check valve located on a vacuum assisted brake booster?

asked by on

Good afternoon, my name is John and I am replacing my power brake booster in my 2007 Lincoln MKX. Was told I need to disconnect the vacuum check valve but I'm not sure where it is located. I have diagrams and what not, but none of them actually say a vacuum check valve. The paperwork I have states that the brake booster check valve must be disconnected from the brake booster prior to removing the master cylinder or the master cylinder seal may be drawn into the brake booster. By chance is the vacuum check valve located with the manifold vacuum hose assembly on the backside of the power brake booster?

My car has 178000 miles.
My car has an automatic transmission.

A: The check valve is built into the hose that...

The check valve is built into the hose that connects to the brake booster. The hose should be disconnected from the booster connection when removing the master cylinder. If you apply vacuum to the hose after you remove it from the booster, you should be able to hold vacuum on the line indicating check valve is good. If it will not hold vacuum, then you will need to replace the line assembly with check valve built into it. If you need help with this repair, YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location to help you replace your brake booster vacuum pump.

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・Save up to 30%

Get a quote

What others are asking

Q: my car is skipping the drive gear and going straight to 3 gear on the gear panel. why?

Hello. There is an open technical service bulletin (TSB) for this issue. The problem is caused by the main computer connection to the transmission control module not being activated when first started. I believe this is TSB reference #23. The...

Q: vacuum hoses

I wouldn't be concerned with PSI rating in regards to vacuum hoses. Vacuum hoses for automobiles are very generic, and anything that is called a vacuum hose should work. Good luck!

Q: What does it mean when the Brake System Warning Light comes on?

The Brake System Warning Light tells you when something is wrong with the brake system on your vehicle. It is necessary that the brakes function properly to maintain safe driving practices. If the Brake System Warning Light comes on, 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...
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...
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.