Porsche 951 New clutch and KEP 1, Slave problem

Mayhem'slv51 · 04-11-2011, 03:42 PM

Hello All,

I've got my clutchnet sprung and KEP 1 installed. I am having a hard time seating the torque tube all the way in. I decided to bolt the clutch slave into position, thinking that engaging the clutch would allow me to insert the torque tube in place.

I noticed the piston on the slave was extended, no problem, I was able to lift the pedal off the floor ( don't know how it got there) and retract the piston enough to bolt the slave into the bellhousing.

Now, my clutch pedal is almost to the floor before I get any engagement, and the pedal won't retract on its own. Should I bleed the slave? With the pedal up, I can physically press on the clutch pivot fork cup and press the slave piston in, then it presses back out a little.

Any ideas? Please help.

Rasta Monsta · Rasta Monsta's Garage

If the slave was off, yes, it needs to be bled. There's a great video on YouTube about the lost art of bench bleeding, or you can just buy a Motive Power Bleeder. . .one of the best tools I own.

Cocacolakidd · Cocacolakidd's Garage

Sounds like there is air in the clutch hydraulic lines - bleed the clutch slave to remove the air from the system and it should be OK.

Another and faster way to bleed the slave is to do it in reverse (One person job) - Get a good size oil squirter can and make sure it is clean of every thing - fill with your brake fluid, attach a length of rubber/plastic hose/tubing then loosen the bleeder screw from the slave cylinder and pump the brake fluid from the bottom to chase all of the air out of the system up and out to the brake master cylinder...

Mayhem'slv51 · 04-11-2011, 04:08 PM

Quote:

Originally Posted by Cocacolakidd

Sounds like there is air in the clutch hydraulic lines - bleed the clutch slave to remove the air from the system and it should be OK.

Another and faster way to bleed the slave is to do it in reverse (One person job) - Get a good size oil squirter can and make sure it is clean of every thing - fill with your brake fluid, attach a length of rubber/plastic hose/tubing then loosen the bleeder screw from the slave cylinder and pump the brake fluid from the bottom to chase all of the air out of the system up and out to the brake master cylinder...

Interesting...should this be done with the reservoir uncapped as well?

Rasta Monsta · Rasta Monsta's Garage

Motive = one person job.

Mayhem'slv51 · 04-11-2011, 07:10 PM

Got a power bleeder from Harbor Freight. Let's see how it does.

Mayhem'slv51 · 04-11-2011, 10:15 PM

Got some fluid and bubbles out, but not much else in form of progress. Pedal still travels to the floor, and clutch slave shaft still rebounds when I press it in, but does not retract as it should. The car is on stands, but I have to figure how to get the back end up, in the middle of my clutch reasembly. Will try again tomorrow.

Mayhem'slv51 · 04-12-2011, 07:10 AM

I am wondering...what are the chances that the clutch fork did not seat under the throw out bearing, when I installed the pivot shaft...? It seemed to be in place before I installed the slave. Just bouncing ideas. Have a nice day everybody!

Rasta Monsta · Rasta Monsta's Garage

Not sure I understand what you mean about the slave shaft not retracting?

Mayhem'slv51 · 04-14-2011, 11:58 PM

Got a power bleeder, the type that uses an air compressor, because the hand pumped one produced 0 results.

Porsche 1 - Me 0

I am stumped. I have the power bleeder attached to the bleed valve. New fluid bottle connected to the brake fluid reservoir. I crack the bleed valve, with power bleeder pulling full vac...nothing. Depress the slave shaft, and a drop spurts out....that's it. It makes no difference if the clutch pedal is down, up, or if I am pressing in on the slave shaft in any of those configurations....nothing.

I put heavy grease around the threads of the bleed valve, which didn't work, I do notice that the bleed valve is somewhat loose, maybe that is the source of my loss of vacuum? Either I am not drawing enough vac, or there is no fluid reaching the slave cylinder. What the H?

robm-951 · 04-15-2011, 01:34 AM

Bleeding the clutch slave sucks! To help the power bleed pull a vacuum, you can pull the bleeder valve and wrap some Teflon tape around the threads. Obviously don't cover the side hole. You also have to watch the front of the brake cylinder reservoir where the slave pulls fluid from doesn't go dry. These have a wall in the reservoir that slows the fluid transfer to that front side. That is why the rear end of the car should be higher than the front to help with that situation.

Or do this and have an easy time

That's what I ended up doing for the second set of master and slaves I replaced and it makes bleeding sooo much easier. It's worth the money in saved aggravation the most and I could never get as good a quality bleed with the factory setup.

Good Luck,
Rob

Mayhem'slv51 · 04-15-2011, 02:09 AM

Just got a bug sprayer from wal-mart, $8. Put 2L of brake fluid in and pumped that SOB up like it was a super soaker. Took the spray nozzle off and put a hose on the end, from my pressure bleeder kit. (All it was good for in the end...spare parts) Tested it and got a nice steady flow, no air. I reverse bled through the bleed valve on the slave.

Hit it again with pedal down, bleed valve open, spray. Closed the valve lifted the pedal, lather, rinse and repeat. Now, pressing on the clutch fork cup... I can feel that the slave shaft seems firm, like the slave is full of fluid. The pedal still drops to the floor, I will have to continue the battle in the morning.

Mayhem'slv51 · 04-15-2011, 02:11 AM

Good night/morning everybody, and thanks for all the input!!

Mayhem'slv51 · 04-15-2011, 04:21 PM

Victory is MINE!!!! I finally figured it out! The previous owner had capped off the supply line from the reservoir to the master cylinder, and put a small reservoir dedicated to the master and slave. I kept wondering what the heck it was, and why the fluid level wouldn't change. I noticed that there was a rubber insert, and I tried pulling on it. To my surprise it came out only to show me a dry reservoir!!! I burped it and reverse bled, and even two-man bled it until I had a little resistance in the pedal. I hooked up my compressor powered bleeder and sucked out all the old fluid, and air...just like I had always hoped to. Now, I have an awesome feeling clutch. AMAZING. I can't wait to get the tranny in and car running!!!!!!@#$#%#$%^$%^$@!!!!!!! Thanks to an injury....This has been an off and on 1.5 yr nightmare!!!! THANK YOU EVERYONE FOR YOUR ADVICE!