If the pedal adjustment needs to turned in to get the air out because it is too tight, It should NOT be tightened up again after the air is out. The free play has to stay in the pedal to keep from having the clutch release when the fluid heats up. Adjusting the pedal tight again will cause the pedal hieght to change while driving and will kill the clutch. If it will not release without the pedal being set too tight something is wrong and needs to be corrected.