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1995 GMC C3500 Repair Question


Topics covered: Clutch, Bubbles, Clutch master.
Mileage: 100,000 miles.

Asked on October 16, 2011

Clutch won't engage or disengage

I replaced the clutch master cylinder and slave cylinder. There was no pressure on the clutch pedal so I assumed it was only a hydraulic problem. Slave cylinder is working fine now, but clutch won't engage. There were no problems with the clutch before this. Am I missing something simple or is it the throwout bearing?
Avatar Asked by Milo

Answer

Replied on October 16, 2011

sounds like you have air left in the system. you need to bleed this system completely. if it worked before then it should work again.

Roy

Tiny Answered by ASEMaster6371 (expert)
24,788 answers provided
Replied on October 16, 2011

I bled the system until I was sure it was good. Do I HAVE to use a vaccuum for this?

Tiny Response from Milo
2 questions asked
Replied on October 16, 2011

it is best too. air is real tough to get out without it.

Roy

Tiny Answered by ASEMaster6371 (expert)
24,788 answers provided

Replied on October 16, 2011

I'll try that. Thanks

Tiny Response from Milo
2 questions asked
Replied on October 16, 2011

good luck

Tiny Answered by ASEMaster6371 (expert)
24,788 answers provided
Replied on October 17, 2011

Still no joy. I don't have a vaccuum, but I tried filling the line from the bottom with a pump. I tried unbolting the slave cylinder, holding it vertical and depressing the shaft and only got a couple of small bubbles. Still won't even break the plastic strap on the slave cylinder but I have good pedal pressure, just can't get it in gear. Any other ideas would be appreciated.

Tiny Response from Milo
2 questions asked

Replied on October 18, 2011

still sounds like an air issue. did you gravity bleed it too??

Roy

Tiny Answered by ASEMaster6371 (expert)
24,788 answers provided
Replied on October 18, 2011

I tried everything but a vaccuum. How much travel should there be on the slave cylinder? Even if the clutch is slipping, shouldn't I be able to get it into gear? Thanks.

Tiny Response from Milo
2 questions asked