Just wondering if you found a solution to this? Our car has an intermittent change of clutch biting point/stiff pedal, it is hard to depress approximately half the time and struggles to get into gear. The clutch does not slip though, I had the master cylinder changed first, then the slave cylinder, at the time the problem was very intermittent, but has now started doing a lot more. If you double de clutch it seems to improve, it also doesn't seem to do it when the engine isn't running. Did you get anywhere with yours? Thanks
