When hooked up, my booster lets me brake pedal travel to the floor with no effect. Once the pedal hits the floor though, the car screeches to a halt. I read a little bit about it being a rubber disc in the booster on the engine compartment side, but mine is intact and looks fine. Does anyone have any ideas? It is a pain driving this car with no power assist.

Thanks, Brian S.

Usually when the brake booster goes the idle raises when you apply the brakes, try it with the car just siting and see ifthe idle goes up also the hard pedal is another sign, there was a htread about testing them I found awhile back, there is away of testing I know. Good luck will send link if I find the thread

The problem is only when the vaccum is hooked up to the booster. At that point there is no pedal feel at all. When off, the brakes function as one should expect with no booster.

Put a vacumn gauge in line to see if the booster holds its' pressure after the engine has been turned off. Place between check valve and booster.