Need help! No Brake Pedal

[68BBC]

Hey guys I have got to get some brakes on my truck so I can move on. Here is what I have, and what I have done so far.
4-wheel disc brake set-up, with correct prop valve. All new lines and hoses. The master cyclinder is good. When you block it off the pedal is hard as a rock. The push rod on the booster has been adjusted to the correct length. I have no air in my lines, nothing but solid fluid coming out each caliper. Ok so here is the kicker. I can take a pair of vise grips and clamp off the center rubber hose that connects the two rear lines, and I have a pedal. I can also clamp off the two hoses that go to the caliper and I have a pedal. I can open one side of the bleeder and push the opp side caliper piston in and fluid comes out the other side. When you push on the pedal the pistons move on the caliper so it's working, but I can't get a pedal it still goes to the floor. I need help. I have been working on these brakes for about two months, and I am about to give up.