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Brake Fittings size - '68 Dual MC 120-130

posted by  malloy1 on  Fri Sep 24 04:31 CST 2010
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last visit: Sun Oct 12 17:44 CST 2014
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Can anybody tell me the size of the threads on a '68 MC? 3/16"?

Paul








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    Brake Fittings size - '68 Dual MC 120-130

    posted by  red92s on  Fri Sep 24 06:14 CST 2010
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    The tubing is probably 3/16" as Walrus mentioned. Most brake fittings using 3/16" tubing are 3/8"-24. There is a metric size that is very close, I think it's M10 but can't recall the pitch (although I know it is classified as "very fine"). I don't think any og the OEM components on a 122 used metric sizes.








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    Brake Fittings size - '68 Dual MC 120-130

    posted by  walrus3 on  Fri Sep 24 04:56 CST 2010
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    3/16" sounds more like the size of the tubing.
    Take a 3/8"-24 UNF bolt and see if it screws in easily, or if that size nut screws on the mating fitting.
    I think that is what the thread is but don't have one readily available to check.
    (I do have one for a 69 140/164 if that seems to be the same.)








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      Brake Fittings size - '68 Dual MC 120-130

      posted by  malloy1 on  Sun Sep 26 06:39 CST 2010
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      last visit: Sun Oct 12 17:44 CST 2014
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      Yup! 3/8-24. I had the second piston stuck in a '68 MC. I used a grease fitting in the back outlet pipe, plugged up everything else except the 7/8" hole and pumped grease into the cylinder until it popped out.

      The threads of the outlet pipes were gummed up with junk. I cleaned out the threaded holes with a cleanout tap (I guess they are called a rethread tap or chase tap).

      Thanks-

      Paul







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