Clutch problem

[Toahk]

Cluch has a Lot of freeplay since today, I was shifting and the pedal hit the floor and didnt come back up. I pulled it up with my hand and it worked ok untill I got home. I drove it some more and the pedal stays on the floor every 10 times depressing it while shifting. I checked for spots to see if there was a leak and didnt see any, and the fluid is where its always been when I look in the Clutch master cylinder. Could this be air in the system? A bad master/slave cylinder? If it is a bad MC/SC do they sell rebuilt kits for them? thanks in advance.

This was also posted in nissan online mechanic but I think I will get more views here, please dont move this mods.

[D-UNIT]

If the fluid inside the resevoir is black, you might have bad M\S seals.

[bvanev]

If I were you I would check the entire Hydraulic system. It could be anything from needing to bleed the system, to a failed operatin cylinder, to master cylinder, or plugged gunky lines.