Sounds like you're losing vacuum, probably at the master cylinder.
Check the hose connection.
There must be a leak or air in the system, try bleeding the system with the car running, have some one pump pedal threee times and hold while you bleed, tell them when to pump and hold. start at right rear wheel then move to left rear then right front and last left front, when done check lines and connections for leaks, make sure to bleed system good, let me know what happens and also does this car have abs system
SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch
change dump valve under master cylinder
SOURCE: 2001 Mustang GT rear brake job
yep this is a two man job, onece you get air in the lines is better to do all four, my has abs and i was able to do it, but next time don't take anylines lose just turn the piston clockwise and you should be able to push it in.
SOURCE: Brake Pedal goes to the floor in my 1990 Chevy C1500 Scottsdale
do you have a self bleeder kit? first off, you have to bleed the master cyl back into its self and the combination valve before you go to the wheels. when you do that, I think you will find that you have air in the lines. disconnect both brake lines from the master cyl and put the bleeder kit fittings on the master cyl, then put the rubber tubing with the kit on the fittings and submerge it in the brake reservoir. make sure its full. then pump the pedal until you get a hard pedal. if that is the case, reconnect the lines to the master, then have an assistant pump up the brake pedal with the engine off, and bleed the combination valve which should be connected to the master by steel tubing. pump it up, then hold it down, and crack the fittings loose, one at a time until the pedal goes about half way down, but do not release the brake pedal until the line is tight again, otherwise you will **** air in the lines. after you do all that, go to the farthest caliper or wheel cylynder from the master and bleed that with the same technique,and dont release the pedal until you close the bleeder screw. unless you have a major prob, this will work.
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