On My way home the other day the clutch pedal felt a little light/weak..i even stalled my car out which is rare...well I made it to my parents house for lunch, after that the clutch pedal just went straight to the floor...ehh! I just had my car tuned and was looking forward to driving it now this! Anyway I thought it could be the slave cylinder so I replaced it but it still gives me the same problems.. I did not install the clutch but was told it was new exedy stage one clutch with a stock pressure plate...I not sure but I don't think its the clutch being I don't smell anything and it was gripping fine before this all happened..

can anyone point me in the right direction of what to look for or switch out? could it be the master cylinder?

thanks!