Re: Power brake broblem

Posted by Ross On 2021/6/4 6:03:34

Two scenarios: The first is that something in the vacuum section has failed and and the power piston is being held down by engine vacuum. In that case the brakes would release not too dreadfully long after turning the engine off.

The second is much more likely: The power piston and consequently the hydraulic piston are not moving back far enough when you remove your foot. The hydraulic piston must come back far enough to tip the compensator valve open. This can be caused by a weak spring, hose clamps on the vac hose, or in one case I saw, the felt silencer pad had been installed inside the booster rather than in the boot.