GM-GMC: Hydrulic clutch, clutch master cylinder, hydraulic brake system

Question
i have a 92 s10 just put in new throw out paring and put the clutch back in but when i push the clutch in ithas nothing soi took it back out and put it on the fram and held it there had some one push in clutch and the pin pushs out about a 1/2 of a inch then loses all presser no leackes no air coming up in the resavor.what is wrong!

Answer
I can only provide a general answer to your question.

You should attempt to bleed the clutch hydraulic system, just as you would the hydraulic brake system.  When the parts are disturbed, by changing the clutch, air sometimes manages to get into the system.

If bleeding does not work, you likely have a slave cylinder (the part of the hydraulic system down by the clutch arm) and/or a clutch master cylinder that is bypassing (fluid slips by the seal inside the cylinder) and not allowing the system to build pressure.

Again, disturbing the system to make repairs can cause this to happen.  Brake fluid (used in the clutch hydraulic system) can draw water out of the air and through a rubber hose!  This leads to rust in the system and failure of the parts.