Originally Posted by Incognegro
What would I look at or test on the master cylinder? Or could it be a air bleeding issue?
Make sure there is nothing preventing the piston in the master from fully retracting. Just a small amount of pressure on the pushrod can cause problems. If the pedal stop or push rod is adjustable make sure there is some slack in it. If all that is good I would suspect a master cylinder problem. Air would just prevent the clutch from releasing, it wouldn't maake it slip.