McLeod Master Cylinder Rebuild Kit
#1
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Well, I didn't get any help in the LT1 section, so maybe I'll find more here. I have a McLeod MC in my 97 T/A. It's part # MCL-139001 (bought off Summit). Correct me if I'm wrong, but this is the same one that you LS1 guys use, right?
Well, I've been having a sticking clutch pedal, so I pulled the MC apart and found a small chunk missing from the cup seal. I found this rebuild kit on Thunder Racing:
http://www.thunderracing.com/shop-by...inder_295.html
Is this the correct kit for my MC? I bought mine in October 2008, so it should be the second generation I think. Thanks for any help!
Well, I've been having a sticking clutch pedal, so I pulled the MC apart and found a small chunk missing from the cup seal. I found this rebuild kit on Thunder Racing:
http://www.thunderracing.com/shop-by...inder_295.html
Is this the correct kit for my MC? I bought mine in October 2008, so it should be the second generation I think. Thanks for any help!
#4
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Join Date: Dec 2008
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Sorry for not answering the phone yesterday I was in a company meeting yesterday for a better half of the day. Before I send the seal kit can you identify on the rubber boot if it says CNC or nothing at all?
#7
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UPDATE!
I talked to Billy M, and he sent me a rebuild kit, FREE OF CHARGE! Just got it in the mail today, and rushed to install it. Got the hydraulics all bled, and she shifts like butter again.![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
Here's everything they sent me. I have no idea what the 2 o-rings are (possibly for the slave?):
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1418.jpg)
Here you can see the new (left) and old (right) piston assembly. Notice the top cup seal of the old piston, that little nick in it. I also noticed that the new piston seal seems to be a slightly different design. The old one had an hourglass shape, the new one is more of a V shape.
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1434.jpg)
And for any of you that have to do this in the future, it is really easy to take apart. Just pop the boot off, and underneath you'll see a snap ring:
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1423.jpg)
Use some snap ring pliers on it, and everything practically falls out. Again, a big thanks to McLeod for helping me out!
I talked to Billy M, and he sent me a rebuild kit, FREE OF CHARGE! Just got it in the mail today, and rushed to install it. Got the hydraulics all bled, and she shifts like butter again.
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
Here's everything they sent me. I have no idea what the 2 o-rings are (possibly for the slave?):
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1418.jpg)
Here you can see the new (left) and old (right) piston assembly. Notice the top cup seal of the old piston, that little nick in it. I also noticed that the new piston seal seems to be a slightly different design. The old one had an hourglass shape, the new one is more of a V shape.
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1434.jpg)
And for any of you that have to do this in the future, it is really easy to take apart. Just pop the boot off, and underneath you'll see a snap ring:
![](http://i238.photobucket.com/albums/ff114/malomanm/McLeod%20MC/IMG_1423.jpg)
Use some snap ring pliers on it, and everything practically falls out. Again, a big thanks to McLeod for helping me out!
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#10
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Since this thread came back up, I thought I'd provide another update. After I rebuilt the MC, it lasted great for about 200 miles, then did the same thing. I opened it back up only to find a ripped seal AGAIN. I believe this was due to a defect on the bore wall.
However, McLeod replaced it for free under warranty with their updated Wilwood-built MC. No issues with that yet.
Overall, I'm very happy with their customer service.
However, McLeod replaced it for free under warranty with their updated Wilwood-built MC. No issues with that yet.
Overall, I'm very happy with their customer service.
#11
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I rebuilt mine last yr (spring inside broke) and ever since then ive had inconsitant engagement and no matter which way i bleed it, it leaks all over the floor. Which was an issue prior as well. I dont know if i want to pull it apart again if its going to do the same thing.