4000 Quattro stuck in neutral w/ stiff clutch pedal

[Rory [Armodis]]

I have a 4kq with a stiff clutch pedal that doesn't return to position.
I've done a google site search and it sounds like the clutch is bad, rather
than the master/slave cylinder but I'd like to get the list's opinion....

The car was running pretty well overall and I was driving it consistently
when the clutch pedal stopped returning to position. The clutch would still
engage but it was a bit dangerous so I garaged the car for a while. I had
the same experience a few times when I had to move it. I have to move the
car again but now the clutch pedal is very stiff starting around the second
half of travel and will not return to position and I can't get it into any
gear. Just stays in neutral.

I noticed the brake fluid level was pretty low, just about at the minimum
line and the car wasn't quite level from left to right so the fluid may
have been lower then the hose going to the clutch master. I filled up the
brake reservoir and had my gf jump in to help bleed the system. Once I
cracked the clutch slave bleeder she tapped the clutch pedel and it sucked
down to the floor. When I closed the bleeder she had to pull the pedal up
with her foot. We did this a few times getting a fair amount of fluid
through the system but there is no change to the clutch pedal; still very
stiff on the second half of travel and doesn't return to position.

I'm wondering if this is a classic symptom of a bad clutch or if there
could still be air in the system causing this problem. Do I need to bleed
the brakes as well to remove all of the air, or only the clutch slave
cylinder?

Thanks!
Rory