I have a 740 turbo with the M46 manual transmission that has a strange problem with the cluch release. The clutch will not completely disengage and drags when the pedal is depressed. This is causing the transmission to grind when shifting into reverse and causes balky shifts into the rest of the gears. I have checked the clutch with the car on a hoist and an assistant running the car with the transmission in 1st gear and the clutch will not disengage enough to allow the rear wheels to stop spinning. The details on parts that have been replaced to try to cure this are as follows. New slave cylinder, new cluch disc/pressure plate/release bearing/pilot bearing, new clutch release fork and pivot, and new brake fluid with the hydraulic system bled multiple times and no trace of air even though the pedal pressure still seems light to me. At this point I am completely stumped and am about to remove the master cylinder to check it, but it is not leaking and shows no sign of having air in it. Has this situation happened to any of you?