3.0 Loosing Brake Vacuum When Car Turned Off

[SJorge3442]

Hey everyone,

Last year when fixing my PCV lines and pulling my intake manifold, I broke the plastic connector (go figure) that connects the large vacuum line to the brake booster. To fix this, I installed a brass (only thing I could find) fitting and then clamped both sides. This works while the car is running, but when I go to start my car, I press the clutch and if I dont stand on the brake pedal, the car rolls. I strongly believe its due to the plastic connector i broke. Does it contain some sort of check valve to keep the vacuum in the booster? The only other thing I think it could be could be the o ring on the master cylidner. The brake pedal is also rock hard when I turn the car off, telling me there is no vacuum in the booster any more.

Heres the hose and a picture of what I am talking about.


Location on the car (ignore the green and red arrows)

[diagnosticator]

Yes, the larger plastic fitting on the hose shown in the pic is a booster inlet check valve. If it is leaking, or missing, vacuum won't be maintained in the booster with the engine OFF. Without the inlet check valve, vacuum will not exist inside the booster as soon as the engine is turned OFF.