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

Clutch feels spongy and car is nearly impossible to get into gear

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Old 03-08-2018, 04:30 PM
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Bfenty
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Originally Posted by rocco16
Sounds like a bad master cylinder to me. What brand is the one you recently installed?
not sure without checking-it was off rockauto.com
Old 03-08-2018, 07:03 PM
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Doesn't help much. RockAuto typically gives us about eight choices of any one particular part, from economy grade to standard grade to professional grade to performance grade.

Last edited by rocco16; 03-08-2018 at 07:03 PM.
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Old 03-08-2018, 09:05 PM
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Originally Posted by rocco16
Doesn't help much. RockAuto typically gives us about eight choices of any one particular part, from economy grade to standard grade to professional grade to performance grade.
Exedy Master Cylinder and Luk Slave Cylinder.
Old 03-10-2018, 05:13 PM
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Found the problem. Is this something I can fix?

Old 03-10-2018, 06:19 PM
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mickey5
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Replace...don't fix except for the cylinders. if you have the old cylinders and they're original save them for a rebuild. they're better than some Chinese junk in the market. There are lots of threads on this subject.
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Old 03-10-2018, 09:17 PM
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VikingTrad3r
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so that is sucking air in not leaking fluid out?
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Old 03-11-2018, 12:22 AM
  #27  
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Originally Posted by VikingTrad3r
so that is sucking air in not leaking fluid out?
I would assume so. My buddy pumped the clutch while I was looking at it, and I didn't see any leaking, but that definitely looks pretty bad. At the very least, it's probably allowing some flexing to happen.

I know what caused it, too-the slave cylinder I purchased has the banjo bolt located at a 45 degree angle instead of being on the side of the cylinder-this leads to the hydraulic line being at an awkward angle and puts pressure on this joint. A younger hydraulic line might have been ok with it, but it didn't do it any good that it's 30 years old.

I'm going to have to get a new line made (unless someone here knows another trick) which is aggravating and probably not cheap. Word to the wise-be careful about the slave cylinder you buy, and if it has the 45 degree angle to the banjo bold, DON'T INSTALL IT.
Old 03-11-2018, 11:33 AM
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^ had my original line rebuilt by a local hose and pipe shop. They re-used the OEM ends and installed a new stainless braided line between, along with a nice rubberized protection tube over it. Think it’s cost about $100 and will outlast the car. Good luck glad you found it
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Old 03-11-2018, 03:05 PM
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^^^^What kind of place is a hose and pipe shop? How would you look it up in the yellow pages or internet? BF will probably need one.
Old 03-11-2018, 04:51 PM
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im in canada so this wont help as i do not believe this place is a us outfit but it will serve as a guide for what terms to search local for

https://www.greenlinehose.com/?mb=1


ive had hydraulic hoses built here
Old 03-11-2018, 05:31 PM
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As luck would have it a farmer friend of mine recommended a place that he uses to fix tractor hydraulics. They should have no problem doing this for me. I’ll post back results when I can do it.
Old 03-11-2018, 11:17 PM
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Any guidance on removing the hydraulic line to take it i someplace?
Old 03-11-2018, 11:34 PM
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84 4+3
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Unthread the top first, otherwise it'll gravity drain the master cylinder. Unthread the bottom and then it should lift straight out. I don't recall any holders on mine.

Last edited by 84 4+3; 03-11-2018 at 11:34 PM.
Old 03-12-2018, 07:53 AM
  #34  
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Originally Posted by 84 4+3
Unthread the top first, otherwise it'll gravity drain the master cylinder. Unthread the bottom and then it should lift straight out. I don't recall any holders on mine.
im almost certain it’s attached to the firewall. I’ll double check though, that would be awesome
Old 03-12-2018, 08:38 AM
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Originally Posted by Bfenty


im almost certain it’s attached to the firewall. I’ll double check though, that would be awesome
If it is there is one 10mm bolt.
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Old 03-12-2018, 08:49 AM
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Originally Posted by 84 4+3
If it is there is one 10mm bolt.
well that sounds way to easy. here's hoping
Old 03-13-2018, 09:22 PM
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Got the line out. I’ll be honest I’m less sure that’s the problem now that I have it off. Still, I’ll get it worked on and put back on and see how it goes.


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Old 03-13-2018, 11:08 PM
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Originally Posted by Bfenty
Found the problem. Is this something I can fix?

What are you seeing that needs to be "fixed"? That outer wrap is probably there to keep the clutch fluid from getting too hot from the exhaust manifold above it. The inner hose does not appear to be leaking at the fitting.
Old 03-13-2018, 11:20 PM
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Originally Posted by RUU
What are you seeing that needs to be "fixed"? That outer wrap is probably there to keep the clutch fluid from getting too hot from the exhaust manifold above it. The inner hose does not appear to be leaking at the fitting.
yea that’s why I’m not sure the hose was the problem. It looked like an issue on the car, but once I got it off it actually looks like it’s ok.
Old 03-14-2018, 01:27 AM
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You may be able to have it tested at a hydraulic shop.


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