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Thread: Matco MC-1 master cylinder question

  1. #1
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    Default Matco MC-1 master cylinder question

    Has anyone ever rebuilt their Matco master cylinders? I'm bringing my baby out of a 10 year slumber and I'm starting at the ground up. Tires and calipers are done, but one master cylinder was sticking. So I ordered two rebuild kits from Matco. Everything looks straight forward except for gluing and sanding a buna plug to the end of the shaft. They are calling for
    1/16" +- .005" below the edge of the shaft and you have to keep it flat! Will this be the odd job that finally puts a mini lathe in my workshop? Or has anyone done this chore before?
    Thanks

  2. #2
    Super Moderator Av8r3400's Avatar
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    Default Re: Matco MC-1 master cylinder question

    I rebuilt my Matco MCs by replacing the o-rings with new rings from my Harbor Freight universal o-ring kit.

    No facing, sanding or gluing required…
    Av8r3400
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  3. #3
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    Default Re: Matco MC-1 master cylinder question

    I thought about just changing the orings myself. The kits were cheap enough in aviation terms, so what do I have to lose?

  4. #4
    kitfoxnick's Avatar
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    Default Re: Matco MC-1 master cylinder question

    If you don't replace the rubber your calipers can get stuck, and you have to take a 1/4" wrench out on some gravel bar and crack the bleeder to be able to get back out of there. Also the rebuild kit requires a special glue for the rubber your talking about. I think I just used a piece of sandpaper to get mine to 1/16 they called for.
    Nick W
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  5. #5
    Senior Member Av8r_Sed's Avatar
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    Default Re: Matco MC-1 master cylinder question

    I did mine by hand and they worked out fine. I'm sure using a lathe would be super, but it isn't necessary.
    -- Paul S
    Model III SN910
    582 IVO Med

  6. #6
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    Default Re: Matco MC-1 master cylinder question

    Yes, they call for Loctite 380. I found a small tube, instead of the $40 one ounce bottle, at Midway gunsmith supplies for just a few bucks. I guess if I can lap the injectors on my truck I can do the same motion with the buna plug.
    Jay

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