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if master cylinder is bad. the pedal will go to floor running or not.when the pedal goes down at a standing stop it is usually the master cylinder thats bad. and losing vacuum. thats if there are no other leaks at wheel cylinders etc. if putting on a new master cylinder, do not forget to bench bleed it! heres how. put the master cylinder in the vise, fill it full of fluid then pump the plunger with a dowel or something soft as to not ruin plunger part.do not let it run dry ! when fluid comes out from master cylinder and no more air is in it. fill it up and put on car. heres what I do! remove the lines from old cylinder on car. as long as you do not lose any fluid doing this, there is no need to bleed air from brakes when done. after on car make sure master cylinder is full of fluid. start the car and pump the brakes a few times, then you should be all set.
Start with brake in the rear that is the farthest away from the master cylinder ( if your master cylinder is on drivers side start with passenger rear,pump up brake pedal until hard have someone else open bleeder valve until air or fluid squirts out,while holding brake pressure even if goes to the floor dont release pedal until bleeder valve is tightened or you will **** air back into the line,do this several times making sure you get a full stream of brake fluid and no air,continue to other rear wheel and then proceed to front wheel furthest from master cylinderand then final wheel. if you still don't have brakes change master cylinder and bleed all brakes again.
There may be air in the lines. Bleed all your brakes starting at the farthest wheel from the resevoir, and finishing at the closest one. Try the pedal after its bled. If the pedal still feels soft or travels to the floor there may be a pinhole leak that may be spraying on the underbody of the car, or the seals in the master cylinder are gone filling the vacuum booster(if equipped). Air compresses more than oil so if bleeding works that may be the problem.
the brakes have to be bleed you wrote that when you start the car the pedal goes to the floor that means the booster is working fine take it back and tell them you want the brakes bleed
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