1966 Barracuda with factory disk: dual master conversion

Brakes for your Classic Mopar

  1. Kevin74

    Kevin74 Member

    Messages:
    21
    Likes Received:
    2
    Joined:
    Oct 26, 2019
    Location:
    Phoenix
    Local Time:
    7:38 AM
    Hey Guys,

    I have a 66 Formula S that already has factory disk brakes. I would like to upgrade my master cylinder to dual chamber. My question is what distribution port to use? The car already has a factory proportioning valve for the rear drums, so I just need a 5-port distribution block.

    My current distribution block is 4 port.
    1. Master cylinder line
    2. Left front line
    3. Right front line
    4 Rear drum line. (It gets split to left/right at the rear of the car)

    So I think I need a similar distribution block, but with two master cylinder input ports.

    Does anyone have a part number recommendation?

    Thanks!
     
  2. pishta

    pishta I know I'm right....

    Messages:
    15,660
    Likes Received:
    5362
    Joined:
    Oct 13, 2004
    Location:
    Tustin, CA
    Local Time:
    6:38 AM
    67 dual mc for disk/drum, larger reservoir is used for disk side. Get any prop valve from a american SAE thread disk/drum car. I used a jeep one that will become your distribution block, or use 'dumb' 3 way block and a prop valve on drum side.
     
  3. Kevin74

    Kevin74 Member

    Messages:
    21
    Likes Received:
    2
    Joined:
    Oct 26, 2019
    Location:
    Phoenix
    Local Time:
    7:38 AM
     
  4. Kevin74

    Kevin74 Member

    Messages:
    21
    Likes Received:
    2
    Joined:
    Oct 26, 2019
    Location:
    Phoenix
    Local Time:
    7:38 AM
    Yes, I think I need a dumb(no proportioning) block with two inlets from MC, and 3 outlets. So this would be a 5 port distribution block.
    Does anyone have a part number for this?
     
  5. hemi71x

    hemi71x FABO Gold Member FABO Gold Member

    Messages:
    4,960
    Likes Received:
    1566
    Joined:
    Dec 22, 2009
    Location:
    Rancho Cordova, CA
    Local Time:
    6:38 AM
    Find yourself a factory disc brake proportioning valve that was used on those cars.
    They are out there, but sometimes difficult to find when your looking for one.
    They are repoped, but it seems it's been hit or miss, if you get a good one or not.
    No, i don't have any more of them for sale.
    Long gone.

    Proportioning Valves 001 (Small).JPG
     
    • Like Like x 1
    • Dartsun

      Dartsun Member

      Messages:
      893
      Likes Received:
      515
      Joined:
      Feb 12, 2012
      Location:
      Springfield Oregon
      Local Time:
      6:38 AM
      When I changed my master cylinder in my 65 Dart 2 pot master front Kelsey Hayes. I just ordered the distribution block and brake lines from inline tube. Fit perfect
       
    • Kevin74

      Kevin74 Member

      Messages:
      21
      Likes Received:
      2
      Joined:
      Oct 26, 2019
      Location:
      Phoenix
      Local Time:
      7:38 AM
      Hi Dartsun,

      If you could share the distribution block part number from Inline Tube, that would be very appreciated. I went to their site, and I didn’t see what I think I need. I believe I need a distribution block with 5 ports: 2 for Master cylinder, 1 for rear brakes, 1 for left front, 1 for right front.

      Thanks!
       
    • Kevin74

      Kevin74 Member

      Messages:
      21
      Likes Received:
      2
      Joined:
      Oct 26, 2019
      Location:
      Phoenix
      Local Time:
      7:38 AM
      Hey hemi71x,

      My car already has a factory proportioning valve in the rear brake line, since it was a factory disk/drum car.

      My hope is to replace my distribution block. Currently, it only has one input port since my master cylinder is a single. I would like to find one that accepts two inputs from a dual master cylinder.

      It’s also very possible that I misunderstand the braking system. From the looks of that photo, you know a heck of a lot more about brakes than I will ever know!
       
    • 66fyssh

      66fyssh Don't Stop Believin' FABO Gold Member

      Messages:
      4,490
      Likes Received:
      2947
      Joined:
      Jun 22, 2013
      Location:
      Northwest GA
      Local Time:
      9:38 AM
      My 66 has factory Kelsey-Hayes. I did mine about 6 years ago with help from some FABO members.

      I used the original distribution block. Ran the back brakes through the proportioning valve and bypassed the distribution block.
      It's basically what @pishta recommended.

      IMG_20191107_200741.jpg

      At the top you can see where I removed the rear line , capped it at the block and connected it to the line from the proportioning valve.

      The bottom line runs to the driver's front. Next on the right runs to the back of the master cylinder. And top right runs over to the passenger front.

      Here's my m/c and Summit prop valve.

      IMG_20191107_201200.jpg
       
    • Dartsun

      Dartsun Member

      Messages:
      893
      Likes Received:
      515
      Joined:
      Feb 12, 2012
      Location:
      Springfield Oregon
      Local Time:
      6:38 AM
      • Like Like x 1
      • Kevin74

        Kevin74 Member

        Messages:
        21
        Likes Received:
        2
        Joined:
        Oct 26, 2019
        Location:
        Phoenix
        Local Time:
        7:38 AM
        Man, you’re the best! Excellent pictures and description. I’m going to copy that scheme exactly.
         
        • Like Like x 1
        • Kevin74

          Kevin74 Member

          Messages:
          21
          Likes Received:
          2
          Joined:
          Oct 26, 2019
          Location:
          Phoenix
          Local Time:
          7:38 AM
        1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
          By continuing to use this site, you are consenting to our use of cookies.