I have a 95 4WD kingcab, V6. This problem kind of came out of the blue. I was finshing my plow route and and my last pass,all of a sudden the clutch pedal didn't come up when I tried to engage it. Thinking it was the Master Cylinder I changed it but that didn't correct the problem. I now have the clutch operation cylinder (slave cylinder??) off wondering if I should change that too. I also see there is a clutch dampener that looks like it has moving parts. The clutch wasn't slipping so I don't think that is the problem. Took both the master cylinder apart and the operation cylinder apart and my untrained eye doesn't see anything out of the ordinary. The only symptom that has cropped up over the past couple months is I really have to get the clutch all the way to the floor to trip the interlock switch. Fluid was full when all this happened. Just strange that BANG - all off a sudden clutch to the floor and it wouldn't come back. I read all the old posts about people that had problems, some dated back to 2003, so I'm looking for a fresh reply. Anybody have this problem before?