long weekend, did shocks,struts,springs,rotors,pads,ss brakelines,and master cylinder. my brakes were fine before i did all this but now my pedal slowly sinks to the floor with my foot on it. i can pump and build pressure but wont hold it. i have bled the lines over and over, i bench bled the mc. what could have gone wrong?

 

master cylinder may be going out. check for leaks / see if your loosing brake fluid. I had similar problem with another car I had swapped to a 300zx mc on a 240sx and eventually the mc broke an internal seal.

 

the mc is reman thats whats pissin me off

 

sometimes the reman MCs can be garbage from the get go... i had to return the first one i bought because it failed from the beginning.

 

yeah that was what i was beginning to think, gonna put old one on and see if thats the case. i only changed because the grommets on top had small leak nothing serious. gonna spend the extra $ for the new mc instead of reman mc

 

put the old mc back on and now i have brakes. wont do reman mc ever again on nething

 

did u get this mc from napa ? i have had several bad experiences with remans from napa

 

autozone, probably even cheaper than the napa one. i paid like 30 or 40 when i could have got a new one for like 20 more dollars. wont ever penny pinch on my brakes again.