Clutch Pedal Sticks at DE's

[chucklaurie]

I posted a few months ago about a sticky clutch pedal during heavy braking and downshifts while at a DE. Basically, the clutch would properly engage, but the clutch pedal wouldn't fully return to its normal position. I could either pull it back to its normal position using my left foot, or if I waited, it would simply 'pop' back into position a few seconds later. The responses on this forum indicated that I could have some air in the clutch slave cylinder. I took the car to the dealer, and they said the same thing. Please note that the clutch has absolutely no slippage.

Before this weekend's DE at the same track, I bled both the brakes and the clutch slave cylinder, using my Motive bleeder and Super Blue. I didn't notice any air bubbles during the bleeding process, and I ran quite a bit of extra fluid through the system to insure there was no air.

The exact same thing happened at this weekend's DE. A couple of mechanically inclined individuals suggested that the clutch slave cylinder could be defective. Unfortunately, the dealer can't duplicate the problem on the street. Any ideas? Should I just talk to the service manager and insist on a slave cylinder replacement? What sort of defect in the clutch slave cylinder would cause this problem to occur?

FYI, this problem happens even during the first lap out, so it definitely isn't related to temperature. Any responses would be appreciated. The car is a 2007 base Carrera with 8,500 miles.

[rrspikemarty]

I posted a few months ago about a sticky clutch pedal during heavy braking and downshifts while at a DE. Basically, the clutch would properly engage, but the clutch pedal wouldn't fully return to its normal position. I could either pull it back to its normal position using my left foot, or if I waited, it would simply 'pop' back into position a few seconds later. The responses on this forum indicated that I could have some air in the clutch slave cylinder. I took the car to the dealer, and they said the same thing. Please note that the clutch has absolutely no slippage.

Before this weekend's DE at the same track, I bled both the brakes and the clutch slave cylinder, using my Motive bleeder and Super Blue. I didn't notice any air bubbles during the bleeding process, and I ran quite a bit of extra fluid through the system to insure there was no air.

The exact same thing happened at this weekend's DE. A couple of mechanically inclined individuals suggested that the clutch slave cylinder could be defective. Unfortunately, the dealer can't duplicate the problem on the street. Any ideas? Should I just talk to the service manager and insist on a slave cylinder replacement? What sort of defect in the clutch slave cylinder would cause this problem to occur?

FYI, this problem happens even during the first lap out, so it definitely isn't related to temperature. Any responses would be appreciated. The car is a 2007 base Carrera with 8,500 miles.

what effect does rapidly pumping the clutch pedal have?

[chucklaurie]

I posted a few months ago about a sticky clutch pedal during heavy braking and downshifts while at a DE. Basically, the clutch would properly engage, but the clutch pedal wouldn't fully return to its normal position. I could either pull it back to its normal position using my left foot, or if I waited, it would simply 'pop' back into position a few seconds later. The responses on this forum indicated that I could have some air in the clutch slave cylinder. I took the car to the dealer, and they said the same thing. Please note that the clutch has absolutely no slippage.

Before this weekend's DE at the same track, I bled both the brakes and the clutch slave cylinder, using my Motive bleeder and Super Blue. I didn't notice any air bubbles during the bleeding process, and I ran quite a bit of extra fluid through the system to insure there was no air.

The exact same thing happened at this weekend's DE. A couple of mechanically inclined individuals suggested that the clutch slave cylinder could be defective. Unfortunately, the dealer can't duplicate the problem on the street. Any ideas? Should I just talk to the service manager and insist on a slave cylinder replacement? What sort of defect in the clutch slave cylinder would cause this problem to occur?

FYI, this problem happens even during the first lap out, so it definitely isn't related to temperature. Any responses would be appreciated. The car is a 2007 base Carrera with 8,500 miles.

what effect does rapidly pumping the clutch pedal have?

[chucklaurie]

I just ran out to the garage and pumped the clutch pedal rapidly. No effect at all, although my left leg did get tired! :D

[RFM]

There is a TSB for the problem IMHO. The problem is in the Master cylinder ( on the pedal ) Just replace the master cylinder.

[Nugget]

Interesting to hear someone else has had this problem. I had this exact issue a few weeks ago out at ECR. Hasn't happened at all driving on the street since then, but I've got a DE event coming up in a few weeks.