1991 Other GMC Models cant get clutch to work.

Lost clutch @ stop sign. Resevoir was low. Filling it didnt help. I assumed failed master or slave. Had a long drive coming up, so I replaced both. Bled both of them every way I could think of, although I havent been able to get ahold of a power bleeder. I seem to have excessive free play, (more than when it worked) No pressure till pedal is halfway down. Watching through the inspection hole, I measure a 1/2" of travel on the slave rod. Should this be enough to disengage the clutch?