Replaced everything, Clutch pedal still go's to the floor.?

Had a problem a while back. Clutch pedal went straight to the floor. Come to find out after taking down that the clutch fork had slipped off the pivot ball. We replaced the clutch anyways. Got that taken care of and put the back in, clutch pedal still go's to the floor. We Bled the system. Still nothing. I replaced the clutch master cylinder, and slave cylinder. Bled the system again. Still nothing. Have fluid coming out of the slave cylinder with no bubbles at all. There seems to be no pressure at all coming from master cylinder down to the slave cylinder, but i have fluid. I can push the rod into the slave cylinder and have someone press the clutch, and it still go's to the floor, with no resistance on the clutch pedal, or at the slave cylinder. I'm stumped. This is on a 1990 GMC K1500 4x4 pickup. Any help would be greatly appreciated.