M/T Problem: Clutch goes to floor without resistance

I am having a problem on my Toyota Corolla Bigbody (2E engine) clutch...

ang tigas ng kambyo ko, hirap kumambyo minsan, minsan may sabit..pero pag inaalis ko yung floor mat (para sumagad yung tapak/lubog ng clutch pedal) Ok, siya ikambyo..then kanina nung mag-checheck ako ng clutch fluid which is ok naman (nasa maximum level), clutch master cylinder and clutch slave cylinder...i checked the clutch slave then pinush ko yung clutch fork tumutulak naman siya....then nung pinaandar ko, ayun na..wala ng resistance yung clutch pedal pero natulak parin daw yung clutch fork pero konti lang daw sabi nung assistant na pinatingin ko, as in di ko na talaga siya mai-kambyo. ano kaya ang problema nito? repair kit lang kaya ito ng clutch cylinder/clutch slave or the worst clutch disc or pressure plate na? sana mapaliwanagan niyo ako dito. salamat.