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Technical What Dual Master Cylinder ?

Discussion in 'The Hokey Ass Message Board' started by lake_harley, Jan 28, 2019.

  1. lake_harley
    Joined: Jun 4, 2017
    Posts: 1,057


    What is a relatively compact dual master cylinder to use for an under floor mounted master cylinder? I plan to build a mount for my '31 Coupe and intend to duplicate the pivot position and height of stock Model A pedals so the pedals come through the floor and work basically the same as stock. Obviously, I don't want the brake master cylinder lid to interfere with the floorboards. For my clutch, I plan to use a compact Wilwood or CNC master cylinder and don't expect any clearance problems. Speedway's dual brake master cylinder just looks quite tall, and another supplier's "Corvette" MC looks quite large as well, so I wanted to get some options based on what others have used.

    Thanks, in advance.

  2. Don't use a dual.
  3. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,918

    rusty rocket

    I'm running a 67/8 mustang for my 40 drum brake setup.
    lake_harley likes this.

  4. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,491


    I'm using a American Motors 1976-63, Jeep 1975-66 1" bore. One of the few that had right side ports. I made an adapter to the '39 pedals for my '28 Tudor.

    Rich S., skip65 and lumpy 63 like this.
  5. lake_harley
    Joined: Jun 4, 2017
    Posts: 1,057


    That '67/8 Mustang MC looks quite compact. Did you use the manual brake version with the 1" bore? Since I envision my bracket/pedal setup will have the brake rod push to the rear of the car with the MC behind the pedals, the outlets appear they would face toward the center of the car, and that would be perfect. I'd imagine in the stock Mustang location it would have been a firewall mount and the lines would have connected on the outward side of the MC?

    I'm curious, 1927graham, why not a dual MC? I clicked on your build link hoping to find what you used on your pickup, but didn't see a MC mentioned during my really quick scan.


    Last edited: Jan 28, 2019
  6. Gasolinefed
    Joined: Apr 17, 2018
    Posts: 105

    from OR

    I don’t know if the size is right but I usually run a 69 nova drum drum master.. 1” bore..

    But my cars aren’t known for there stellar brakes

    Edit - I’ve got one in my 29 and pedal pressure is the concern..
    Last edited: Mar 11, 2019
  7. s55mercury66
    Joined: Jul 6, 2009
    Posts: 3,980

    from SW Wyoming

    I need to file that away for future use. It looks like a mirror image to the '67 Mustang 1".
    Rich S. and lumpy 63 like this.
  8. lumpy 63
    Joined: Aug 2, 2010
    Posts: 1,304

    lumpy 63

    I'm using the jeep master on my stude Its mounted under the floor so I removed the residual pressure valve's from the master and installed in line valves. 2lbs for the front discs and 10lbs for the rear drums...Stops like a charm.
    skip65 and Apenaut like this.
  9. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,491


    I also used it on my girlfriends '60 Lark wagon.
    skip65, Apenaut and lumpy 63 like this.
  10. butch27
    Joined: Dec 10, 2004
    Posts: 2,831


    I 'm using a Dodge truck..Under the floor. and made a remote fill for it to fill under the seat..
  11. AMC360
    Joined: Jul 24, 2007
    Posts: 76

    from Canada

  12. RacingRoger
    Joined: Sep 11, 2017
    Posts: 196


    Why not use a dual? Just curious....
  13. Hey, I'm from Northeast, IN.
  14. 29moonshine
    Joined: Dec 30, 2006
    Posts: 1,294


    I used a 67 nova on my 29 chevy stops good

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