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Thread: Dual Master Help

  1. #1

    Default Dual Master Help

    As usual, our local auto parts stores can't find a part without Year, Make, Model. I want to buy the Wagner F66857 Master Cylinder that is recommended in several threads here. This is for the dual brake conversion. Anyone know what this fits? Another wasted trip to town!
    SFC, HQ,129th Sig Co, PAARNG, Vietnam Era

  2. #2
    Join Date
    Dec 2003
    Location
    SF Bay Area, CA
    Posts
    499

    Default

    I typed the number F66857 into NAPA's PartsPro SE online catalog and It came up with this interchange number UP 36246 at $66. maybe that will help. MFG is United

  3. #3
    Join Date
    Dec 2003
    Location
    SF Bay Area, CA
    Posts
    499

  4. #4

    Default That Helps

    Quote Originally Posted by hiker View Post
    I typed the number F66857 into NAPA's PartsPro SE online catalog and It came up with this interchange number UP 36246 at $66. maybe that will help. MFG is United


    Thanks, I'll try NAPA. I was at Autozone.
    SFC, HQ,129th Sig Co, PAARNG, Vietnam Era

  5. #5

    Default Tube Bender

    While I'm at it, any recommendations on a tubing bender?
    SFC, HQ,129th Sig Co, PAARNG, Vietnam Era

  6. #6
    Join Date
    Jul 2007
    Location
    Rhoadesville, Virginia (five miles from no place)
    Posts
    5,125

    Default

    Quote Originally Posted by rboltz View Post
    Thanks, I'll try NAPA. I was at Autozone.
    Ahhh, there's the problem....

    NAPA is usually a lot better about cross-referencing part numbers than the Wal-Parts.

    As far as bending tube, just grab some of the polymer coated green line at the NAPA while you're there. You won't need a tubing bender to bend it. It will not kink and you can make your tight radiuses around small sockets.
    "Free advice is worth what you pay for it."™

  7. #7

    Default

    Quote Originally Posted by randyscycle View Post
    As far as bending tube, just grab some of the polymer coated green line at the NAPA while you're there. You won't need a tubing bender to bend it. It will not kink and you can make your tight radiuses around small sockets.
    Does this come in various lengths, already flared?
    SFC, HQ,129th Sig Co, PAARNG, Vietnam Era

  8. #8

    Default

    Quote Originally Posted by rboltz View Post
    Does this come in various lengths, already flared?
    yes it does. its good stuff.
    67 #18820 mostly stock...

  9. #9

    Default Another Question

    In a past thread about the master cylinder swap, this comment was posted;

    In the front brake circuit don't terminate 3/16" line at the master cylinder, the brass flair cone is too big. Use 1/4" line and convert to 3/16" line down at the tee

    What does this mean about the brass flair cone? Not sure I know what that is other then a reducing fitting? Is the 1/4" line only about the termination or is it required to operate properly? Other posts say they used 3/16" everywhere and some say 1/4" everywhere.
    SFC, HQ,129th Sig Co, PAARNG, Vietnam Era

  10. #10

    Default

    That means the 45 degree flare (internal sealing surface) is a different size relative to the line size. If you look inside a fitting you can see the flare surface. It's conical. Like the bottom of a funnel pointing at you. The brake line seals against this with the ferrule nut pushing the line into the sealing surface. Size does matter. A simple adapter will insure the sealing surfaces are compatible.

    There are AN fittings (army navy) that are 37 degree. Whole different animal.
    Those are single flare verses the 45's double flare. Not compatible at all.

    Meaning the 45 degree flare uses a folded over portion to seal. I can explain better if needed.
    Liz, covid, murdered 10/19/21

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