Clutch won't engage or disengage

MILO

MEMBER
1995 GMC C3500
100,000 MILES

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?

8 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

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

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Sunday, October 16th, 2011 AT 2:06 AM

MILO

MEMBER
5 POSTS

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

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Sunday, October 16th, 2011 AT 2:29 AM

MILO

MEMBER
5 POSTS

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.

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Monday, October 17th, 2011 AT 11:50 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Still sounds like an air issue. Did you gravity bleed it too?

Roy

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Tuesday, October 18th, 2011 AT 3:50 AM

MILO

MEMBER
5 POSTS

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.

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