I have a problem where if I leave my clutch down too long, it stops working. Meaning it wont release, and i have to let it out (sometimes pull it out), then it'll work again unless leave it down too long (5-10 sec). Im pretty sure its somethign with the hydraulics, either the master cylinder or the slave cylinder. Now i dont want to buy both, so is there some way to tell which is bad?

 

Look at 3 places first.
1) Look physically at the slave cylinder and see if you see where fluid has leaked from it.
2) Look at the hypraulic line that runs from the master to the slave. Where it switch from hard to soft line will sometimes leak at the fitting to the soft line.
3) Look at the firewall behind the master cylinder and see if you see fluid.