C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Clutch trouble

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Old Apr 27, 2012 | 05:58 PM
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Default Clutch trouble

Having trouble getting the clutch to disengage. I drove the car over to a friend's garage to replace the backup switch. Removed the slave cylinder to replace the switch. Finished the work and found that the clutch won't disengage. I have replaced both the slave and master cylinder thinking that they when bad. PS both where a year old with about 2000 miles on them. Have blend the system many many times. Can't get any pressure. Pedal goes to the floor. See small bubbles in the master cylinder. Can't get rid of. Don't see any leaks in the tube linking the slave and master. Read the Chevy shop manual for clues. No help.
Does anyone have any ideas what it could be.

It drove over there fine, now nothing. Driving me crazy.

Thanks Tim

Last edited by TSHANNON; Apr 27, 2012 at 08:37 PM. Reason: missing word
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Old Apr 27, 2012 | 06:28 PM
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Not sure why you took the Slave off and replaced.

You have air still in the slave cylinder. You have to fill the slave with a syringe or something like that, the replace the hose never allowing air to get back into the slave.

Then before you get the slave back on......bleed it with it just hanging.....BUT beware!!! What happens is the slave rod will travel all the way to the end of it's throw.....and then your pedal will get hard when you have all the air out....but if you push too hard at this point, you'll shoot the rod right out the end of the slave and life will be bad. So push lightly while you are bleeding

Then mount the slave back on....you should have some pedal now.....the thing is self bleeding as well....over time it will get better as the bubbles travel up the tube and out the Master when used.
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Old Apr 27, 2012 | 06:42 PM
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I wonder if the end of the slave pushrod isn't on the depression in the clutch fork. That would cause exactly what you are describing.
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Old Apr 27, 2012 | 06:51 PM
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Originally Posted by TSHANNON
Having trouble getting the clutch to disengage. I drove the car over to a friend's garage to replace the backup switch. Removed the slave cylinder to replace the switch. Finished the work and found that the clutch won't disengage. I have replaced both the slave and master cylinder thinking that they when bad. PS both where a year old with about 2000 miles on them. Have blend the system many many times. Can't get any pressure. Pedal goes to the floor. See small bubbles in the master cylinder. Can't get rid of. Don't see any leaks in the tube linking the slave and master. Read the Chevy shop manual for clues. No help.
Does anyone have any ideas what it could be.

It drove over there fine, now nothing. Driving me crazy.

Thanks Tim
Had to remove the slave to get at the backup switch. Did everything you described. Replaced the cylinders one at a time, thinking that one of the components failed.

Last edited by TSHANNON; Apr 27, 2012 at 06:55 PM.
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Old Apr 27, 2012 | 06:54 PM
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Originally Posted by VetteMed
I wonder if the end of the slave pushrod isn't on the depression in the clutch fork. That would cause exactly what you are describing.
Removed it many times thinking the same thing. Wish I could see in there when system is assemblied. Really don't want to bend the dust plate back on the tranny to see in there.
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Old Apr 28, 2012 | 05:44 PM
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Originally Posted by TSHANNON
Removed it many times thinking the same thing. Wish I could see in there when system is assemblied. Really don't want to bend the dust plate back on the tranny to see in there.
Just remove the inspection cover, it's 3 bolts...
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Old Apr 28, 2012 | 11:06 PM
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What year C4
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Old Apr 29, 2012 | 12:38 PM
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Originally Posted by outlawtubbywales
What year C4
It is a 1991.
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Old Apr 30, 2012 | 07:56 PM
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Originally Posted by VetteMed
Just remove the inspection cover, it's 3 bolts...
Have another question about a cause for not being able to pressurize the system. Could I have a leak in the hydraulic line between the master and the slave? I do not see any leaks on the line or any damage. What is your thought?
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