SOURCE: 89 c1500, full pedal on brakes until started then
adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
Bruce Pike
SOURCE: New master cylinder and booster. Brakes stop good
Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.
SOURCE: Brake pedal goes nearly to
I would go with not bled correctly
The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake
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