I replaced the clutch in a buddies truck last weekend and am having trouble bleeding the air out of the hydraulic system. It is a master/slave cylinderset up. The master cylinder was replaced about 3 months ago because it was leaking. The slave is original. After several unsuccessful attempts to bleed the system I removed the slave cylinder to better understand how it works. It appears that is there was any proplem with it, it would either be seized up and not work at all or it would be leaking fluid and have a noticeable drip coming from it. It has neither. I then removed the master clutch cylinder to get a better understanding of how it works. Holding the master clutch cylinder in my hand, I held my finger over the outlet connection and used a screwdriver to press the piston in, as the clutch rod would do if the clutch pedal was depressed. It did pressure up as expected. It appears that all of the components are working as they should. Is there a trick to bleeding this system. If I fill the master reservoir and bleed the clutch as I would a brake system will that do the trick? i.e. pump the clutch pedal then hold it in, open the bleeder screw on the slave cylinder to push the air out, then close it, release the clutch pedal and repeat the procedure until the clutch works as expected.