the pressure in my clutch line leaks away when i hold my clutch down and it doesnt return the pedal. Does ne one know a trick to finding out which clyinder is the problem or do i just need to start with the slave or what? There is no fluid dripping away from the slave cylinder. Can it fail without leaking? Is there a check valve in the master cylinder thats failed that is allowing the pressure to leak back up into the resevoir? Thanks for your help, its a 87 325.