My car has begun to rev high when I change gear, it runs ok other than the high revs. I have had the diagnostic test done, but everything is normal. The gagage think it may be the clutch is on the way out as the pedal is very high, the car pulls ok and goes into gear ok.

I have noticed a slight brake cylinder leak at the back and wondered if this would possibly be allowing air into the fluid which also serves the clutch master cylinder. any help would be appreciated.