Clutch pedal sticking at high rpms

[JustAnotherVictim]

I have an 87 turbo and clutch operates fine until the rpms get around 4500+ then the pedal will stick sometimes it comes back up verrrrrry slowly other times not at all. I'll pull it out and afterwards it will act fine. It seems also that when I try to shift when the pedal is in it will not go into gear. I just changed the tranny fluid and my friends and I did a bleed on the clutch maybe not enough possibly but it only seems like high rpms are the problem.
thanks for any help.


For anyone who finds this thread it ended up being the clutch master cylinder being bad.

 

[aye mate]

Yea try bleeding the clutch line again. That would be my first guess. Not sure why its only doing it at high RPM tho'. Anyone else?

 

[JustAnotherVictim]

Yea I can't figure it out either but I was thinking I'll do a complete bleed and get all the old fluid out, I just can't figure out the high rpm only part

 

[GrimJack]

I'll throw in a clueless bit here. I can't see any way that the clutch could be affected by RPM... even the throw out bearing should just make evil noise, not affect your pedal.

 

[JustAnotherVictim]

I can't hear any noise when it happens, considering it didn't have a radio for a week or so engine music :icon_razz

 

[IJ.]

Not sure if it's the same with pull clutches but with a push clutch if things aren't machine correctly or worn a bit it can effect the geometry of the throwout bearing causing it to stick down by centrifugal force at high RPM's.
(think of a low finger Chev Clutch V's a high finger clutch this was dont to prevent it going over centre at RPM's)

I imagine it applies to pull clutches just that it would be opposite tolerance stackup causing it compared to a push.

 

[Nick M]

Does the clutch engage when the pedal is still on the floor?

 

[JustAnotherVictim]

Does the clutch engage when the pedal is still on the floor?

Negative
At least not as far as I can tell. I've tried but hasn't worked yet. I'll have to double check that when I take it out again.

 

[Nick M]

Sounds like the throwout bearing might be hanging up then. You have access to a lift to check it out physically?

 

[JustAnotherVictim]

I'd have to jack it up in my garage so I guess I could get to it.
Exactly what am I checking? The bearing itself or something keeping it from operating correctly? I'm a bit new to stick shifts.

 

[Nick M]

Non smooth splines, or with out lubrication. Possibly burred.