1989 Dodge Truck • V8 4WD Automatic • 150,000 miles

I cant get a good brake pedal in a 1989 dodge w250 pickup I have replaced the rear shoes, springs and wheel cylinders, replaced the calipers, pads and rotors in the front also replaced the master cylinder and lines, also bypassed the proporting valve cause it wasnt woking.I have bled the brakes several times and the rear brakes are adjusted. Any suggestions?
March 1, 2011.

Are you sure the new master cylinder is good? Was the push rod adjustable when you replaced the MC?