how do i tell if slave cyl. is bad? my clutch is slipping all of a sudden at around 4g's and sometimes pedal is hard and high and sometimes pedal is soft and low as if air in slave cyl. is it bad or clutch time. what clutch should i use for about 350 hp on an s4 and what flywheel pro or street lite?thanks

 

Bleed the system and get all that air out of there. Then check the master, slave, and soft line for leaks. There should not be any fluid leaking out of any of them. Since it is easy to spill a bit of brake fluid when bleeding the system, wipe up the excess and wait a day or two and then check for leaks again. If you see either of them are leaking they should either be rebuilt or replaced. The kits to rebuild them are about $20+ (a piece) on mazdatrix and $60+ to replace each of them.


The clutch slipping over 4k might be a sign that it's on it's way out or cannot handle the 350hp. You could always drop the tranny and do an inspection of the flywheel, clutch and pressure plate.