Clutch pedal slams to the floor when pressing it... - 986 Forum - The Community for Porsche Boxster & Cayman Owners

rob76turbo · 01-26-2010, 06:09 AM

Just put in a new IMS, Flywheel, Clutch, Slave Cylinder, in my car. When we finally started it (it is still on the lift), I wanted to make sure it shifted gears properly, so I pressed in the clutch pedal and it slammed to the floor and stay there. I turned off the motor and reached down and pulled the pedal back up. I had bleed the clutch slave before reinstalling everything. But the slave did not pop and spill fluid everywhere so I guess I did not toast the new one....

Also when we first started the car, one of the rear wheels would spin slowly. We could put a hand on it and it would stop, but the other would spin. But by pressing on both sides we could make both wheels stop spinning. Is this normal when the pedal goes to the floor and there is no pressure on the clutch.

So....do I need to rebleed the system? What is the procedure when the clutch pedal drops to the floor like that AND did I maybe toast my new slave cylinder?

Thanks in advance!
Rob T.

stephen wilson · 01-26-2010, 09:09 AM

I don't have much to add, except that the wheel turning is normal drag. The same thing happens with my wife's RSX. Try bleeding again while slowly running the clutch pedal thru it's stroke by hand?

root_werks · 01-26-2010, 10:23 AM

You mentioned bench bleeding the master, but did you bleed the system? Once everything is installed back in the car, you must bleed the system as a whole. One small pocket of air to compress and presto, no workie.

rob76turbo · 01-26-2010, 10:34 AM

No....I did not bleed the system

My fault. I am going to do it this evening when finished with work. Hopefully, I can actually drive the car tonight!!

Gilles · 01-26-2010, 11:27 AM

Quote:

Originally Posted by rob76turbo

No....I did not bleed the system

My fault. I am going to do it this evening when finished with work. Hopefully, I can actually drive the car tonight!!

Rob,
Borrow or buy a Motive pressure bleeder, it will make the bleeding process much easier and quick, I bought one of these many years ago (+/- $50) and it gets used constantly (all hydraulics)

rob76turbo · 01-26-2010, 11:31 AM

I have one (but it is missing the seal that presses up against the brake fluid resv), so I am using a friends. But I also took a look at the one offered by Bavarian Autoworks and it is very nice. I plan to add that to the tool list and get one at some point. I love the Motive bleeder, but this one looks better.

root_werks · 01-26-2010, 12:47 PM

Keep us posted!

ARModen · 01-26-2010, 01:48 PM

Bleeding is definitely the answer.

However I did have a 944 where the clutch hydraulic lines were all steel except for a 5 inch section of braided stainless over rubber tubing to go around a corner. I replaced both cylinders and everything would work perfect for the first few shifts after I bled the lines. Then I'd lose the clutch pedal and have to refill and rebleed the lines to get it working again.

It turned out that the rubber had degraded so much that it was oozing fluid when I pressed the clutch then sucking in air when I released it. It took me most of a day to find it, but then it was a $2 fix. Just something to check if bleeding the system doesn't seem to be working very well.

rob76turbo · 01-26-2010, 06:32 PM

Yep....needed to be bleeded again. I am very surprised how sweet and easy the clutch engagement is. The old hard pedal actuation was a sure sign that the old clutch / flywheel was starting to go.