Check the fluid level. Sounds like a leak somewhere, perhaps at the slave cylinder. The slave seem to be prone to leaking at the large piston seal.
2007 GT Premium, Redfire. CAI. Bama Tune. CMDP's. Pype-Bombs. 3.73's. SR 62mm TB. Remote trunk mod. 20% tint.
2010 Xterra Off Road. (The tow rig)
2008 Commander. Hemi. (wife won't let me touch it)