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

Clutch Slave

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Old Dec 20, 2010 | 02:22 AM
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Default Clutch Slave

Can anyone tell me what the symptoms of a degraded or failing clutch slave are? 90 L98 with ZF 6sp.
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Old Dec 20, 2010 | 08:23 AM
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The trans will be difficult to shift into gear, especially into reverse. You should be able to shift into reverse while stationary without grinding gears or forcing the lever. The feeling is that of a clutch that is not fully released, because that is the result of trouble in the hyd. system.
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Old Dec 20, 2010 | 08:49 AM
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also check the fluid level in the master resevoir. It is located on the driver's side just over the battery. You can also check underneath for dripping fluid from the bottom of the bell housing. If the slave is leaking, it usually does so into the bell housing and will work it's way out from the lowest point in the housing (just in front of the oil pan).

Along with the aforementioned symptoms, the clutch pedal will get progressively more spongy and will go deeper to engage.
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Old Dec 20, 2010 | 09:41 AM
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If I don't drive it I will be out of clutch fluid in a week.
Once filled with fluid it takes a LOT of pumps to get any pedal back.
One time I even had to crack the bleeder to get fluid flowing.

Thank goodness the 2010 season is over so I can replace all that old stuff.
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Old Dec 20, 2010 | 10:35 AM
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Thanks guys.
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Old Dec 20, 2010 | 12:40 PM
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Originally Posted by lt4obsesses
also check the fluid level in the master resevoir.


Your slave isn't bad if you're not losing fluid.
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Old Dec 20, 2010 | 03:15 PM
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Originally Posted by GREGGPENN


Your slave isn't bad if you're not losing fluid.
I agree with you and lt4obssesses that checking the fluid is the first thing to do, and I should have mentioned it. But, if the pushrod seal of either cyl is compromised, would you not have symptoms noted by the OP? Would you not then have internal leakage, not necessarily visible? That's how I interpreted the piece by Bill Boudreau (zfdoc) that is archived on the forum, and it seems to mirror my experience with clutch cyl problems.
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Old Dec 20, 2010 | 09:57 PM
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Originally Posted by sailorsteve
But, if the pushrod seal of either cyl is compromised, would you not have symptoms noted by the OP?
What symptoms noted by the OP?
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Old Dec 21, 2010 | 09:46 AM
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Originally Posted by GREGGPENN
What symptoms noted by the OP?
I must be bumped in the head, I confused this thread with another one on the same subject when I wrote my response.

Also, after rethinking your post and my recollection of my own clutch issues (6 yrs ago), I realize that if the pushrod seal craps out, and prevents a full stroke, the fluid that leaks by has no place to go, other than to leak out.

I'm just going to have to start going to bed earlier, or something.
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