A few days ago I drove into work with nothing out of the ordinary. When I went to leave, the pedal initially felt normal, but over about 15mi it progressively released lower and lower until it stopped releasing entirely and the pedal felt softer by then. I figured the MC failed, so I replaced it first(and I have a new slave on-hand too). I'm not confident that I got all the air out, but the slave does move the fork about an inch. However, I can push the pedal to the floor easily with my hand and the clutch still doesn't disengage(the pedal always had a rather heavy feel). I'm going to replace the slave today, thoroughly rebleed, and double-check the pedal adjustments. I don't know if the clutch is original. If it is, it has about 230,000mi. I also have a new clutch and flywheel just in case. I'm just trying to avoid dropping the trans right now.

Does this sound more like a clutch/fork failure or a problem with the hydraulics?

 

I'm sure they can fail in different ways, but my experience with clutch failure is always a slipping clutch long before complete failure. Yours sounds like a hydraulic problem. I've got 300,000 miles on my original clutch, which doesn't mean they all last that long, but they definitely can if you're fairly nice to them.

I've had a couple crazy issues with clutch pedals, and both were hydraulic. One was leaking fluid, the other...I'm not totally sure but had to do with either air or water in the line and very, very cold temps. The clutch worked in reverse. I could idle, in first gear, sitting still with the clutch pedal out. When I'd push the clutch to the floor, the truck would start slowing creeping forward...

 

I should add that the fork end is about 1/2" lower than the slave cylinder so the pushrod is angled downward. It has me worried that the fork or pivot broke.

 

Annnnd....the fork is broken in half. Guess I'm dropping the trans.

 

Wow! I never would have expected that. Well, at least now you know...