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

Clutch Master Cylinder Failure

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Old Aug 21, 2002 | 10:23 AM
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Default Clutch Master Cylinder Failure

Just so you'll know what it is when it happens to you...

Riding around; nothing out of the ordinary...On a downshift, the clutch pedal engages farther down than normal...Only happens once, next few shifts are OK (normal pedal)...

On the way home, the pedal "feels low"...I get home, the last downshift going into driveway is very low...

Check fluid level...there ain't any... :rolleyes:

Get a flashlight, look up under dash at firewall...Yep, there's the missing fluid... :cuss

I have an email into 18carfan now, just waiting for confirmation to order both cylinders... :sleep:

It lasted 5 years for me; no telling how long for previous owners...


[Modified by Rich B., 9:24 AM 8/21/2002]
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Old Aug 21, 2002 | 10:34 AM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

I have leaking fluid also. So that's where the fluid is disappearing to. :lol:
Let us know how much carfan sells the clutch slave and and master for shipped to your door.

FYI - Just read a article on replacement. The guy bleed the system by pushing the fluid from the clutch slave towards the master cylinder. He said it gets ride of the air bubbles better this way. Once the master fills up then bleed it using the normal procedure.
Go figure
:confused:
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Old Aug 21, 2002 | 10:47 AM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

http://www.rockauto.com/ Has kits to rebuild...will save you a bundle
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Old Aug 21, 2002 | 11:07 AM
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Default Re: Clutch Master Cylinder Failure (JonM)

http://www.rockauto.com/ Has kits to rebuild...will save you a bundle
I just bought Master and Slave from Rockauto a couple of weeks ago. Good prices and they were Wagner.(under $200 for both)
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Old Aug 21, 2002 | 11:07 AM
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Default Re: Clutch Master Cylinder Failure (ConeKLR)

The guy bleed the system by pushing the fluid from the clutch slave towards the master cylinder...
"Reverse bleeding"; it's supposed to be the latest rage... :rolleyes:

I replaced/flushed all fluid about 18 months ago; hose & bottle method, had no problem. '86 has bleed screw already in "highest point" attitude...

JonM: Thanks for the link! I'm off to Advance/NAPA/AutoZone now to see about kits...I'm pretty sure no one will have them in stock :D , so I'll probably order from your link...
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Old Aug 21, 2002 | 11:10 AM
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Default Re: Clutch Master Cylinder Failure (dans86)

I just bought Master and Slave...they were Wagner.(under $200 for both)
...$200!!!...GASP!...(feels heart; sure it's having cardiac arrest)...

Wagner? Not Repco? I'd rather have Repco (OEM)... :(
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Old Aug 21, 2002 | 11:13 AM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

Try the The Last Detail web site. They are pretty good with pricing and customer service. :yesnod:
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Old Aug 21, 2002 | 11:36 AM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

I put in both rebuild kits 3 years ago. No leaks since.

The replacement hyd line is routed higher on the firewall than stock '86. Probably a good thing to get it further away from the exhaust.

New line and both kits came to less than $100 + 1 evening labor.
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Old Aug 21, 2002 | 05:12 PM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

I just pulled both cylinders and hyd line.

For those interested :sleep: , the easiest way was to pull wheel; remove rear wheelwell; remove battery. Unbolt cruise servo; let hang. Unbolt strut; let hang.

Undo hyd line at master; undo two 13mm master bolts. Use 2x4 between seat track & pedal to push pedal to firewall. I could now reach in to firewall opening (from under hood) and pry rod off stud. Remove master.

Reach down next to steering shaft and remove hydraulic line clip bolt.

Go underneath, pull rubber boot out of bellhousing; undo hyd line; undo two 15mm slave bolts. Remove slave; remove hyd line.

Try and find cylinders or kits locally; impossible.

Think about supper...And Braves baseball... :yesnod:



[Modified by Rich B., 5:11 PM 8/21/2002]
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Old Aug 21, 2002 | 05:22 PM
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Default Re: Clutch Master Cylinder Failure (ConeKLR)

Let us know how much carfan sells the clutch slave and and master for shipped to your door...
18carfan says $149 & $140 master/slave :eek: ...S&H extra, of course...Have to order...

There's a bit of confusion as to what master I have (new style or old), so I need to verify first... :sad:

I may do like Hendej says, and try the repair kits...I already have a new hyd line ready to go in...
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Old Aug 21, 2002 | 05:38 PM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

My clutch slave is leaking. What all comes with the repair kit?
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Old Aug 21, 2002 | 06:14 PM
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Default Re: Clutch Master Cylinder Failure (C4-Wolf)

My clutch slave is leaking. What all comes with the repair kit?
Besides the neoprene seal, I'm not sure...

...But the bore of my master cylinder has more than a little pitting, so it looks like I'm in for new cylinders... :sad:
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Old Aug 22, 2002 | 02:40 PM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

...But the bore of my master cylinder has more than a little pitting, so it looks like I'm in for new cylinders... :sad:
At those prices I'll probably do the same rather than risk the extra downtime.
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Old Aug 22, 2002 | 05:02 PM
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Default Re: Clutch Master Cylinder Failure (C4-Wolf)

At those prices I'll probably do the same rather than risk the extra downtime.
AutoZone had Master for $114 and slave for $71...

NAPA had $130 & $107 I think it was...

Both had kits for ~$29 & ~$12...
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Old Aug 22, 2002 | 05:22 PM
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Default Re: Clutch Master Cylinder Failure (Rich B.)

Good to know, thanks.
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