clutch hydraulics

[bluemane500]

hey guys i just put a new master clutch and slave cylinder on my 85 any tips on presurizing or bleeding out air,,,i have no pedal at all,, thanks in advance for any advice

[DougM]

Having just gone through this with my '84, first pull the guts from the master and make sure they are the same as the old. Here is my RL post and in the thread is another thread about the MC differences. I bled mine a hundred times and then realized this was the problem. Right after bleeding or after the car got warm, it would shift fine. Once cold, I would get grinding into reverse and a dragging clutch. I cut the piston down 4.5mm and all is tight.

Clutch hydraulics driving me nuts - Rennlist Discussion Forums

Also, the reverse bleed method really is easy. I just put a smaller tube on my power bleeder and reverse bled from the slave with 5lbs of pressure. Only a few ounces of fluid are needed to get it to the reservoir so a mityvac could also work. after fully draining from the slave. Took all of 30 seconds and there is no air in there anymore.

[bluemane500]

thanx doug,, i was just gonna try the reverse bleed by gravity,,, i have a mighty vac but i didnt know it works in reverse

[Pete R]

I know it helps to have the car at an angle too. Front up rear down I think.

[DougM]

Originally Posted by bluemane500

thanx doug,, i was just gonna try the reverse bleed by gravity,,, i have a mighty vac but i didnt know it works in reverse

reverse bleed by gravity? Gravity bleed will most definitely leave a pocket of air in the master. Mity Vacs can be used as a pump. Believe me, I spent days trying to get mine right until I cut off the extra 4mm from the piston. The reverse bleed is the quickest and best way to do it.

[bluemane500]

well i did the reverse bleed with an oil can with a pump ,it worked perfectly,,,the master and slave i bought from porsche and its seems to be good so far,, it actually works better than it ever did,,there may have been some aftermarket hydraulics in there to begin with,, porsche was like triple the money of similar vendors.i just took it out for a ride for the first time in three months,, im sorry i promised to sell it to someone

[DougM]

See if it works the same after cooling down. Mine always worked right after bleeding. If it drags next time you drive it, check the piston in the MC.