Okay here is the scoup. I have a 1988 5spd GTU. The clutch is building no pressure at all. I rebuilt the Clutch master and slave twice, Brand new everything Before it was the Master losing fluid so i rebuilt it and it holds the fluid, Also the slave was part of the problem too because it went later because the boot was dry rotted. Now that both are rebuild. After so many times of bleeding the Clutch it wont hold pressure. You press in the clutch a few times and it loses all pressure to engage the clutch in gear. When I start the car also and have it in 1st gear it works but when you try to press the clutch and put it in 2nd there is no pressure. Gears dont grind either when you put it in gear. You have to keep pumping to build up pressure but when you try to put it in gear it loses all presure. I check for air leaks with A liquid tester and there is no air comming out or fluid, The bleeder also is not leaking. Any suggestions why its not working ?

 

Weird. Maybe you didn't rebuild them correctly. Try this. Find a friend with an identical working set on his car. Swap out the whole thing. If it works, great, drive aff fast before your friend knows what happened. (just kidding). Swap your friend's stuff piece by peice into yours to see which part of yours is failing. Then you will know which part, the slave, master, etc. is messed up.