Losing clutch pressure...help?

[TantrumSKID]

I left my '99 GSX stored in my garage for 1.5 weeks while I was on vacation. When I came back the car drove fine for about 50 miles and then I lost my clutch pressure overnight. Checking the slave cylinder I disovered all the fluid was gone! I filled it back up, pumped the clutch for awhile and the pressure returned to normal. I never had problems with storing the car for periods of time before, but now everytime I leave the car idle for more than 2-3 days, my pressure disappears. I have no idea what is wrong. During the times the car is in the garage I am the only one who has the keys so I'm positive it's not driven by anyone in my household. Moreover, it seems the longer I leave it stored, the worse the situation is. After 2-3 days of not driving, my pressure is gone only for a min or so and after I pump it a few times everything returns to normal (no drop in fluid levels at all). Can anyone tell me what these symptoms represent? Leak in the clutch lines? Dying clutch? Thanks in advance.

-Mike-

 

[Defiant]

Trouble in the hydraulics, if there's no wet carpeting around the pedals, then probably the slave cylinder. Get RRE's stainless line while you're at it.

http://www.plymouthlaser.com/slave2.htm

http://www.plymouthlaser.com/masterc.htm

http://www.roadraceengineering.com/instructions/2gclutchlineinstructions.htm