Ok so I bought a whole new hyd, clutch system from GM when doing my trans. IT was all pre-bleed from the factory. IT seems after I unhooked the slave from the housting somehow air may have gotten in. Sometimes it will grind gears like the clutch is not fully disengaging. Especially if I'm at a light and hold hte clutch pedal down for 10 seconds striahgt.

If I pump it, it tends to get a little harder.

 

Do you have enough fluid in it?

I was able to bleed mine by un-hooking it and just pushing it in and out with my hand until bubbles appeared in the resevior

 

Fill reservoir. Loosen the nuts on the master till the end of the threads, unbolt slave, open reservoir, push slave in, close reservoir cap(while the slave is pushed in), hold slave lower then master and vertically and pump the slave as many times as you can, take a break, pump some more, take a break, pump some more, until you can't see bubbles form in the reservoir. Bolt slave back up, bolt master back up. Check fluid level and add as needed. Don't remove reservoir cap until the end.