Clutch won't engage or disengage

Tiny
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?
Sunday, October 16th, 2011 AT 2:04 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
Tiny
MILO
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  • 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 2:15 AM
Tiny
ASEMASTER6371
  • MECHANIC
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It is best too. Air is real tough to get out without it.

Roy
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Sunday, October 16th, 2011 AT 2:19 AM
Tiny
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I'll try that. Thanks
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Sunday, October 16th, 2011 AT 2:25 AM
Tiny
ASEMASTER6371
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Good luck
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Sunday, October 16th, 2011 AT 2:29 AM
Tiny
MILO
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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
Tiny
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Still sounds like an air issue. Did you gravity bleed it too?

Roy
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+1
Tuesday, October 18th, 2011 AT 3:50 AM
Tiny
MILO
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  • 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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Tuesday, October 18th, 2011 AT 5:37 AM

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