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1992 with clutch problem

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Old Jul 9, 2021 | 01:22 PM
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Default 1992 with clutch problem

I have a 1992 , 6 speed, with 74,000 miles. This week I had a problem getting the car in gear, and also, with clutch fully depressed, and coming to a stop in first gear, the car wanted to continue going forward, like the clutch is not engaging properly. A friend who sold me the car in 2014, said he had just replaced the clutch but not the pressure plate. I have put on only 4,000 miles since I bought the ca, and since the clutch was replaced. Any ideas?
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Old Jul 9, 2021 | 02:40 PM
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Clutch hydraulics are leaking/failing and not fully disengaging the clutch from the flywheel. Do not drive it like this, it's a great way to toast your transmission.

Check your Clutch Master reservoir directly under the ECM (which is under the hood on the driver side). You unbolt the ECM, lift it out of the way and check the resevoir to make sure it is full... My guess is you will find it empty or near empty. If so you have a leaking master or slave. In order to drive it, top off with DOT3 fluid and use the ranger method to bleed it (google) and to attempt to get the air out of the system. That should restore your pedal while you wait to repair the actual problem. Then, if you are careful, monitor the level in the reservoir and keep it topped off until you can fix and it should be safe to drive for a bit like this.

The master often leaks INTO the cabin so nothing ends up on the ground (so check for wetness in the foam/below where the shaft from the clutch pedal goes to the master in the footwell) or the slave leaks into the bell housing. If you confirm this is the problem, replace the clutch master, slave and I suggest the braided steel line as well. Definitely replace the master and slave together...

Last edited by pedricd; Jul 9, 2021 at 03:01 PM.
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Old Jul 10, 2021 | 09:40 AM
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Thank you for the info!
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Old Jul 10, 2021 | 09:44 AM
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Thank you. By the way, I checked under the clutch pedal and it is dry.
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Old Jul 10, 2021 | 10:00 AM
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Originally Posted by roblward
Thank you. By the way, I checked under the clutch pedal and it is dry.
did you check where the rod goes through the firewall to the master?

Is your clutch reservoir low/empty? Most likely culprit is the clutch hydraulics and there is probably air in the system now.

since there was work done on the system maybe there is a mechanical reason it’s not disengaging fully but I would think that far less likely...such as the clutch fork ball stud backing out.

again, if your buddy didn’t replace the pressure plate maybe he also skimped on replacing the hydraulics? My understanding is any time the clutch is replaced or clutch work is done the hydraulics should be replaced.





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Old Jul 10, 2021 | 02:06 PM
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So I unbolted and removed the ECM unit today and checked the hydraulic fluid. It was full.
Is there such a thing as a clutch just needing an adjustment, like in the old days when drum brakes needed an adjustment occasionally?
I'm planning on bringing it in Tuesday to the repair shop that I've used for years, and I'm hoping it's something that simple.
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Old Jul 10, 2021 | 06:57 PM
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Originally Posted by roblward
So I unbolted and removed the ECM unit today and checked the hydraulic fluid. It was full.
Is there such a thing as a clutch just needing an adjustment, like in the old days when drum brakes needed an adjustment occasionally?
I'm planning on bringing it in Tuesday to the repair shop that I've used for years, and I'm hoping it's something that simple.
Maybe someone else will chime in but the source of your problem *should* be somewhere in the clutch hydraulics especially if this just developed and was fine prior. There is no manual adjustment at all...it’s a fairly simple system...I would have expected the reservoir to be low...it’s acting like there is air in the system although it should self bleed.

Only other thought as mentioned is something coming loose physically but I’d think you’d have other issues (make sure your master and slave are fully tightened down and are not loose)...or perhaps the clutch disc itself is too thick (but you would have had that issue from day one)...or you could have a bending/cracked clutch fork so that it cannot fully disengage the clutch anymore...

Hydraulics are easy and cheap, the rest involve pulling the trans.

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Old Jul 13, 2021 | 12:26 PM
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Thanks again!
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Old Jul 14, 2021 | 11:22 AM
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Originally Posted by pedricd
did you check where the rod goes through the firewall to the master?

Is your clutch reservoir low/empty? Most likely culprit is the clutch hydraulics and there is probably air in the system now.

since there was work done on the system maybe there is a mechanical reason it’s not disengaging fully but I would think that far less likely...such as the clutch fork ball stud backing out.

again, if your buddy didn’t replace the pressure plate maybe he also skimped on replacing the hydraulics? My understanding is any time the clutch is replaced or clutch work is done the hydraulics should be replaced.
Well, considering the fact that so much crap comes from China anymore, replacing (clutch) components isn't always preferable to staying with the OE stuff.
That said, Rock Auto has served me well - never had an issue (yet) on quality built clutch hydraulic components...Just sayin!
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Old Jul 14, 2021 | 11:29 AM
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Originally Posted by Paul Workman
Well, considering the fact that so much crap comes from China anymore, replacing (clutch) components isn't always preferable to staying with the OE stuff.
That said, Rock Auto has served me well - never had an issue (yet) on quality built clutch hydraulic components...Just sayin!
You aren't wrong there...but if they are shot you have little choice (yes I've heard it MIGHT be possible to rebuild them but you are on your own?). The Chinesium replacements are at least cheap $$$ to match the quality. I replaced mine last year (LUK if I recall) and no issues so far...I think it was around $60 for the master/slave total...most expensive part was a quality braided line ($110 from zip corvette) but that is not something that would need to replaced normally (I figured it's probably original on a 27 year old car at the time I might as well!).

Last edited by pedricd; Jul 14, 2021 at 11:34 AM.
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Old Jul 14, 2021 | 12:59 PM
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Originally Posted by pedricd
Maybe someone else will chime in but the source of your problem *should* be somewhere in the clutch hydraulics especially if this just developed and was fine prior. There is no manual adjustment at all...it’s a fairly simple system...I would have expected the reservoir to be low...it’s acting like there is air in the system although it should self bleed.
Only other thought as mentioned is something coming loose physically but I’d think you’d have other issues (make sure your master and slave are fully tightened down and are not loose)...or perhaps the clutch disc itself is too thick (but you would have had that issue from day one)...or you could have a bending/cracked clutch fork so that it cannot fully disengage the clutch anymore...
Hydraulics are easy and cheap, the rest involve pulling the trans.
This. As far as I know, there is no adjustment for the C4 clutch hydraulic system. If everything is working properly and the fluid is full, the system is self-adjusting.
My clutch works great but the take-up (grab) is all near the top of the pedal travel. I understand this means the disc is worn pretty thin and the clutch will require replacement soon.
Since your fluid is full and no hydraulic leaks, I would suspect a problem with the fork or fork pivot, I have read about a few people having issues here. Good luck.
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Old Jul 14, 2021 | 01:09 PM
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Originally Posted by DGXR
...My clutch works great but the take-up (grab) is all near the top of the pedal travel. I understand this means the disc is worn pretty thin and the clutch will require replacement soon...
I don't think that is necessarily the case. Mine is similar and I've heard that's pretty typical even with a new clutch on C4s.
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