Clutch pedal softens over night???

This just happened last night. I drove home from school and everything was fine. Then the next morning (this morning) the clutch pedal is soft enough where I cannot put the car into gear. We filled the clutch master cylinder and pumped it like there is no tomarrow and it worked fine. Within a few hours the same thing occured. Im thinkin it might be the master cylinder itself, but I was wondering what you guys think before I run off to buy another master cylinder. Any replies is greatly appreciated.
Thanks in advance

Within a few hours the same thing occured.

Did you lose any of the brake fluid you just filled when it happened?

Check all your lines. Have a friend look at the slave cyl when you are pumping and make sure its acutating all the way. Try bleeding it.

Check your lines if then are good check the nuts that connects the lines togh...... i had the same problem with my clutch and it was leaking from one of the nuts that connects the lines......

sounds like slave cylinder blew.try bleeding it..it's on the tranny theres a bleeder on it
if you look and it's wet theres your problem.
good luck......


scrapper...