Hydraulic Clutch Linkage Problem

[pro70z28]

A couple days ago my son lost the clutch on his 95 Z-28. He said he noticed it not shifting right the last couple days. (T-56) (I assumed that was because the slave cylinder wasn't traveling far enough as it was going bad.) The clutch didn't slip & there were no tell tale noises of something going bad inside the bell housing. We had it towed home and yesterday Jeff put a new clutch master & slave cylinder in. There are no bleeder valves so we've been trying to bleed the system by bench bleeding, installing & pumping the pedal, etc. We've had it in and out of the car several times trying everything we can think of but still no werkie. Is this a normal problem bleeding with with new parts? Is there a trick to making this easier or do we just keep trying to bleed the air out until it works?
Is there a chance we have other issues? I didn't think so because what little I can see through the slave cylinder mounting hole everything seems to look & feel o.k. inside the bell housing. That and there were no signs of mechanical problems with the clutch itself before this happened.

Jeff has a tune-up date with the dyno next week & really wants to get this deal figured out soon.

Thanks in advance for any helpful info.


Both master & slave cylinders are the plastic units if that makes any difference at all.