Okay, so brake lines, calipers, pads, rotors and even the master cylinder has been replaced on a '99 chevy blazer. The dilemma is that the system bleeds and pressurizes fine with the engine off. However, as soon as the engine is started, the brake pedal is going to the floor. Basically, we are unable to maintain a pressurized brake system once the engine is started.
SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch
change dump valve under master cylinder
SOURCE: 1998 chevy C-1500 brake problems
Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps.
Good luck!
SOURCE: brakes
Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.
SOURCE: brakes to the floor(almost) 99 blazer
bleed the brake again. if the pedal goes to the floor with little resistance, then the master cylinder is your problem.
the shim is to depress the noise when you applied the brake. you can skip that, if the brake works without it.
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
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