Pelican Parts Forums - doing a clutch bleed, but there is no fluid???

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- - doing a clutch bleed, but there is no fluid??? (http://forums.pelicanparts.com/porsche-964-993-technical-forum/749322-doing-clutch-bleed-but-there-no-fluid.html)

If the pedal gets sucked to the floor, you still have air somewhere in the system.
Check for a torn boot on the master. If torn, there is a good chance contamination has ruined the seal.

The fluid in the brakes is much cleaner than the one on the slave cylinder. I think the black sludge inside the Clutch Slave cylinder could be from the deteriorating rubber boot?!

Silly question - how high is your rear jacked up? :)You realize that slave cylinder is just a bit lower than reservoir. If you jacked rear high enough your cylinder will be above reservoir and hydrodynamics laws will stop working.

Quote:

Originally Posted by pi5tolpete (Post 7437205)

Traveller, thanks for showing just how clean a pedal cluster can looked when compared to mine ;)

I bled again this morning, and with 10psi on the can, I tried the pedal. It returned to normal with exuberance! But with the 10psi off the system, it hung again. So, one more bleed, check, ok, so I buttoned it up. Test drive allows for good shifting with the occasional hanging pedal. I will try the allen bolt adjustment to allow the pedal to 'spring' back a bit more. That spring is confusing, it actually is spring assist for clutch pressure, not spring return for pedal return position, backwards of what I thought it would be for. The spring return is at the tranny.

Car lives for a Mothers Day treat, then to our host for a few parts!

Peter

The Bentley Service Manual does call for 22 PSI on the reservoir.
"- Press and hold clutch pedal to the floor
- Pressurize
- Open bleeder valve until clear, bubble-free brake fluid emerges. Close bleeder valve.
- Slowly pull clutch pedal from floor to normal rest position.
- Depressurize and disconnect bleeding device. Add brake fluid to the reservoir if level is below max.
- Check clutch operation. If necessary, repeat bleeding procedure."

I also think that the procedure described above on cleaning and lubricating the master is important.

Chuck

How does the kinematic lever "wear"? Does it bend or break? Does a hole in the lever get elongated or enlarged? What actually gets worn out of spec?

I'm about to replace the clutch hydraulics in my car and was curious.

The pivot points on the kinematic lever become elongated and changes the lever geometry. This causes the petal to hang-up at the point where the mechanical advantage changes.

A PITA job due to the space you are working in to take out the petal assembly but doable. Change the plastic sleeves on the petal assembly at the same time. Less than $2.

Quote:

Originally Posted by ChuckJ (Post 8629038)

This is exactly what worked after messing with it a couple hours only getting air. Other trick was filling the reservoir COMPLETELY until it almost over flowed. Maybe I have the rear of the cat too high.

Thanks Chuck!