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Thread: Brake system overhaul

  1. 23rd September 2009, 07:20 PM #11
    peterg1001
    peterg1001 is offline Master
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    It's a bit smaller than 1/2" UNF, and bigger than 7/16" UNF. In fact, the minor diameter of the thread is 7/16" (I can just get a 7/16 bolt into the hole inside the threads).

    I guess the next step is to take it down to Better Brakes and see if they have a fitting which goes in.

    Peter
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  2. 16th October 2009, 10:57 AM #12
    peterg1001
    peterg1001 is offline Master
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    In answer to my own question, the picture below shows how it all fits together.

    Yes, there are metric and imperial mixed on the same fitting.

    Yes, the 3/8UNF on the master cylinder connects to the 7/16UNF on the proportioning valve.

    Yes, the 12mm on the master cylinder connects to the 3/8UNF on the proportioning valve.

    No, the 3/8 fittings don't connect to each other, that would be too sensible.

    I hope this helps somebody else, it took a while to figure this lot out.

    Peter
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  3. 26th April 2011, 10:53 AM #13
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    waughloch
    waughloch is offline Fossicker
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    Quote Originally Posted by peterg1001 View Post
    Can anyone tell me the thread sizes of the brake pipe fittings on a NRC4880 proportioning valve and a NRC6096 master cylinder? I'm pretty sure the proportioning valve has 3/8 UNF and 7/16 UNF fittings, and the master cylinder has a 3/8 UNF, but what the other fitting on the master cylinder is I have no idea. It's about 12mm in size, but it's not metric and I don't think it's UNF either.

    Any help appreciated, thanks, Peter.
    Witworth???? Old English maybe
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