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The slave cylinder could be failing which allows air into the system. The clutch pedal will start sticking to the floor intermittently, before it fails completely. When it does you'll know, as clutch fluid will drain onto the floor. I had this happen with an aftermarket clutch.
A leaking slave is often caused by an out of balance flywheel, sometimes due to improper torquing at the factory. This causes the slave to wobble, which in turn introduces air into the sytem. There is a TSB on this issue for the C5.
Yet another possibility is the clutch fluid contains excess moisture, as it is very hygroscopic. When the fluid heats up it can result in a sticking clutch pedal. The cause is the same as a brake system that has moisture in it which results in a soft pedal, or even none at all. Regular fluid changes can help in this regard.
In any case, the sticking clutch pedal is usually the result of air in the system.
Last edited by No Doubt : 10-25-2006 at 06:09 AM.
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