In reply to # 1488288 by maueman Don't give up on bleeding the clutch system. My story SHORT I replaced the flywheel with light weight aluminum one, new clutch and plate. Bleed the system. Went for a short ride. Clutch started to disengage at a stop light. Got it home and. bleed it again. Same problem. Removed the tranny, clutch, flywheel found nothing wrong. Put it back in the car and bleed it again. same problem. WTH. Out comes the tranny ( passenger side) again. Install another new clutch assembly. Back into the car again, Same problem. Clutch would not disengage. Changed the slave cylinder and installed a slave pushrod with an adjustable one. Same problem. WTH. Got a vacuum bleeder and bleed the system again with all new fluid. NOT SILCONE OR DOT 5 that's was the 2 different fuids that I used. Went with Castrol dot 4 this time. Put 2 bottles through the system and low and behold everything worked perfect......Was it the fluid? Was it the way I was bleeding the system? Did an air bubble get trapped in the slave? I don't know. But 5 days wasted....Just don't give bleeding it again.
Silicone/DOT5 fluid is well known for holding trapped air bubbles in suspension for a long period of time.
Classical bleeding methods create lots and lots and lots of bubbles, but in conventional fluid they coalesce quickly.
It's also important to install the slave cylinder with the bleed nipple above the hydraulic line, rather than beneath it.
Because trapped air rises.