I bought an act and am kinda having this problem also.... Mine seems to be the hydraulic part of the clutch though.... It leaks a little fluid down by the pedal...
Does it make the sound when you press and realease the clutch when the car is not on. My makes a sound like a spring expanding. Im not worried about this problem though, cause i think the increased power of my clutch has worn out both my axles hehe, good luck fixing your problem...