i have a 1992 isuzu trooper, when i bought it the clutch pedal was very soft but it engaged and shifted fine. Recently the clutch began slipping under torque, yesterday the pedal went completely soft, and now the clutch won't engage at all. I replaced the master cylinder due to leaks found inside around plunger, after installing new master cylinder, and bleeding the system , i have absolutely no air coming out of the slave cylinder bleed screw, and still I have no pedal at all, can't even get vehicle into gear. Cold this be a faulty slave cylinder too or do you think I need to replace the clutch?