I to would be thinking of Hydraulic pressure build up, possibly due to badly adjusted or faulty M/C cylinder.
Check there is a clearance on the m/c push rod. As said check you can push the slave in by hand.
Cheers Aidan
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Hyundai Accent 1.3 12v 1999 - Clutch slip, possible flywheel? - Fixed # - Matt Harrison December 30, 2010, 5:06 pm
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