After swapping in a new t5 into my 91 z28 I made it about 25 miles before the hydraulic system died. Clutch pedal was dead so I figured I'd replace the whole system. New reservoir,master cylinder, hose that runs between master and slave cylinder, and new space cylinder. I got it all in and didn't have a way to bench bleed the master cylinder before installing. So after an hour of pumping the pedal and bleeding it the old fashioned way I bought a mighty vac vacuum and bleeding gun. After 30 minutes of using the tool I still haven't gotten any fluid or pressure built up from the system. Am I missing something? Could I have a bad master cylinder? Any info would be greatly appreciated.

 

Didn't come prebled?

Fill the reservoir, unbolt the slave and hold it at a 45 degree angle with the pushrod facing down and the hose up. Push the rod in and out by hand until the bubbles stop.

If its an aluminum slave, loosen the bleeder and let it gravity bleed first

 

If it did I was unaware.

So far I haven't had anything come out from the bleeder.

It is an aluminum slave I believe. Do I need to let it gravity bleed while at an angle? I've let it gravity bleed bolted up for 3 weeks now.

 

put the mitty vac on just the master cylinder outlet and see if you can pull fluid out of it.If yes reattach the line .Then put the mitty vac on the other end of the line (take it off the slave cylinder first).Try to pull fluid out of it.

 

It can also help to pump the slave manually and check for bubbles in the reservoir. I do that often