Quote:
Originally Posted by ched454
The hydraulic slave cylinder doesn't care whether the car is running or not running.
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True, but... excerpt from this
website
"...The clutch pedal is connected to the disengagement mechanism either by a cable or, more commonly, by a hydraulic system. Either way, pushing the pedal down operates the disengagement mechanism which puts pressure on the fingers of the clutch diaphragm via a throwout bearing and causes the diaphragm to release the clutch plate. With a hydraulic mechanism, the clutch pedal arm operates a piston in the clutch master cylinder. This forces hydraulic fluid through a pipe to the clutch slave cylinder where a another piston operates the clutch disengagement mechanism. ..."
The slave cylinder is used to engage/disengage the clutch; if there is insufficient hydraulic pressure the slave cylinder would be unable to perform its function properly. There is more stress (pressure) on a clutch when the motor is running vice when it is not.
I say check the slave cylinder, it is a win, win. If it is the slave cylinder, you just fixed it, if not, then you know it is something mechanical; throwout bearing would be my guess.