mrt96gt

I have a 96 mustang gt. The clutch pedal was extremely stiff. Replaced the clutch and PP with stock new units also ford cable, throw out bearing, pilot bearing, bbk aluminum quadrant, ford clutch fork and pivot ball. Lubed the shaft that the throw out bearing rides on. Re installed everything and wow great for a couple of days then boom !!!!! Pedal is hard as a rock again ! Anybody with some insight please help !