I have a 90 f-150 and cannot get the clutch to disengage. I replace the hose and the master cylinder. If you disconnect the fitting on the tranny the pedal stops dead, however it will not push the clutch enough to disengage the truck. I got the hose from ford and the master cylinder from autozone. Should I try a ford master cylinder or can you get a higher flowing master cylinder. Also what is the best way to bleed out the clutch, from what I can the clutch does have all the air bled out.

 

What about the slave cylinder, mine went some time ago, the pedal went to the floor....

 

pedal comes right back, as if working right, just does not disengage the clutch

 

As I recall, the clutch pedal would return to the normal position when the slave cylinder went bad. What I mean by "went to the floor", it wouldn't build pressure/ resistance until I had the pedal almost to the floor, even then it was a SOB to shift gears.......good luck