Had my breaks checked. Brake Check told me it was the master cylinder and front breaks needed replaces. I purchased new master cylinder and replaced the old one. It went fairly well. I bench bled the new master cylinder and had little trouble installing it ... BUT when I bleed the system nothing goes well first a broken bleeder screw on my passenger rear, I replaced the wheel cylinder. Then I bleed in the order recommended by my Chiltons. Passenger rear, Driver front, driver rear, passenger front. Things go well until I get to the driver rear. My buddy pumps the pedal, holds, I open the screw, Fluid, I close the screw, system pressure is crap. It is worse than before, almost no pressure on the system. I start again and the same problem. I try and skip the driver rear and move to the passenger from and I get the same problem. I can get some pressure back if I just bleed the passenger rear and driver front, but the driver rear and passenger front mess everyithing up. No when I drive it I get some pressure, the brakes are soggy and there is this "clump" when I press the pedal about halfway through my braking. I can feel it in the pedal and the pedal jumps to the floor. Any help is appreciated.