Re: Bad Brake Booster?
Before you condemn the booster, hook up the hand vacuum to the booster, through the new check valve and all, just as if installed aith manifold vacuum going to it.
As Steiner suggests, the assembly should hold vacuum for most of the day.
If it leaks down, check the pedal rod is not holding the atmosphere valve open as in applying the brakes, should be a little slack between the pedal and booster, maybe a 1/16-1/8 inch. Might have to hook up a return spring on the pedal to keep it from 'riding' the booster.
I think you also need a vacuum reservior and the pump connected to the tank outlet to booster as I read the pump is connected to the manifold and cannot achieve a better vacuum - carb has holes - see them - open throttle plates. The manifold hose should be connected to the tank via check valve so under decel, vacuum from the engine is greater and helps 'supply' the tank with vacuum pressure by opening the check valve. At other times, idling, accelerating, the vacuum pump supplies the vacuum.
Vacuum boosters generally need a minimum of 13 inches of vacuum to function correctly.
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