85fortheDrive

Picked up a new slave cylinder from 928 Intl and some kind instructions from Jim Bailey. My across the street neighbor is a SCCA racer and has been nice enough on many occasions to come over and lend a head and a hand to my repair efforts.

The symptom here is a clutch pedal that sticks to the floor. My understanding is that happens when the piston in the master cylinder goes past center.

I install the new slave, connect the hydraulic line, fill the brake/clutch reservoir and am ready to start to usher air out of the system. I pump the clutch pedal while he stays under the car to watch for fluid to come out of the loosened nipple. But no fluid ever arrives. We don't notice any more than a 1/4" drop in the reservoir fluid level. Clutch pedal continues to need to be pulled and pushed.

Now, we kept the nipple open for both directions of clutch pumping. Should we have always closed it for when we pulled the pedal up?

Or might there be something more drastically wrong with the master cylinder?

Thanks folks.

Tim

ZEUS+

Closed when pumping, you keep sucking air in with bleeder open.

indefactorX

When i had this problem, i had to use the Cheat method for removing air from the slave cylinder

This involves Removing the piston in the slave cylinder ever so slightly until fluid starts to come out (be Careful because it is spring loaded & that piston can shoot out at you and you'll have to start all over). I forgot where this DIY Is but it worked every time with me.. I had a leak in the master cylinder line so it happened quite often to me.

You'll need a c-clamp puller

Good luck

indefactorX

oh and yes, Closed on the up stroke lol

BTW Motive power bleeder is a great investment, turns it into a one man job

ceedee

i had that problem ,too
and i think it happens as a result of something else wrong along the clutch-line.
maybe there is another leak someplace, and there is not a lot of pressure on the lines to begin with

hacker-pschorr

Zeus nailed it.

If the slave nipple is always open, you are just moving air in/out of the slave. Path of least resistance - if the slave valve is open, air from the slave will fill the master. If the valve on the slave is closed, fluid from above will be sucked into the master. Once the pdal is out, open the valve on the slave & pump out the air.

Rinse - Repeat

Brett Jenkins

Here's how did this on my 944, 924s, and 928s4.



Buy a common garden sprayer, the pump up kind. Put enough fluid in that it won't empty before the system is full.

Make sure your system is free of fluid.

Put a fairly long rubber hose over then end of the sprayer and tightly over the open bleeder nipple, long enough that you can operate the pump from the side of the car and see the reservoir.

Depress the clutch pedal, I think.

Pump up the sprayer and squeeze the trigger, the pressure will force the fluid backwards through the system and fill the reservoir. You really don't even have to let it fill the reservoir, just let a little in and stop. You can fill it from the top after that.

Remove the hose and tighten the bleeder.

Raise your pedal and check its operation.

This has worked like a charm for me every time.

nosnow

a 1/4" drop in fluid is indicating you are below the baffle in the resovour. This is tricky. I had to fill the master up to almost overflowing. Pump a couple times, refill, Pump once, refill... you get the point. There is an internal baffle and if the driver side of the car is the high point you will never get a good bleed.

Once you think you have it bled, there is a bleeding trick mentioned on the board where you push the shaft of the slave back in with plyers resulting in a reverse bleed to get rid of all the air. This worked for me.

85fortheDrive

Well the power bleeder arrived today and accomplished in ten minutes what two of us were unable to do in three hours. That tool is a keeper. Tomorrow will be Take Your Old Shark to Work Day for me.

Big thanks to Erik and Malcolm for all their coaching and support. Hacker was kind enough to call just to check in on our progress. Two stellar members of this great community.

Thanks folks.

Tim