braking problems

[Dillon79scotts]

I recently replaced my 1/2 running gear for 3/4 ton. bled the lines, and seems to not have very good brakes, pedal went to far and it steered bad.

got a new MC and bled it, then bled my lines again. will build pressure great and then you let off for about 3 seconds, and go to push it in again, and it hits the floor for like 5 pumps..

checked for leaks everywhere, replaced MC again (warranty). TRIED starting the truck, and did no difference. i figured if one of my lines were leaking i would still have brakes on either front or rear but i lose them all. so im thinking its the proportioning valve back to the MC somewhere.

i dont understand this also, if i pump it up and let it go like i said above then try it again i lost it all, but if i only let it up like 3/4 the way and push down again, ive got pressure still. keep in mind this is the 3rd MC ive returned to O reilys as a warranty


has anyone ran into this problem? my flare fittings look fine also. using the pump and crack the bleeder screw method