Ok, so my 87s clutch was limp every am until I pumped it up, then it was fine all day, noticed some oil on fuse block, master cylinder bad... Bought new one installed it, crawled underneath it, had helper pump almost 2 reservoirs through without letting it go past half. I have good pedal after pumping it up, but then sometimes it will go limp. Not sure what the issue is now, I see no leaks yet and are not loosing any fluid. I suspect it still has air in it. Any suggestions or secrets? I kept the hose submerged in brake fluid while bleeding it, while bleeding it really sounded like air was going through the lines, although I saw very little bubbles. I was thinking of renting a vacuum pump to bleed it.
I'm dead lined until I get this figured out.
Thanks in advance.
Mike

 

push pedal half way down then open bleeder push pedal to floor close bleeder let up pedal repeat

 

Helps to bench bleed the master a lot before install also.

 

Bench bleed...Oh well, little late for that. I am going to try a vacuum bleeder on it. Hopefully its something simple like air in the lines still, My brakes where not this tricky once I got the right part from auto zone.

 

I have the vacuum kit and vacuumed 360ML of fluid through it, I still see air bubbles and have a good clutch after pumping but then it goes limp again...

Any suggestions?

 

rebuilt or new?

 

New from Auto ZOne.

 

There's your issue.. I've had a lot of problems with China made masters and slaves.
Get a better quality part.