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master cylinder size

Discussion in 'The Hokey Ass Message Board' started by mosimpson, Nov 15, 2010.

  1. mosimpson
    Joined: May 29, 2006
    Posts: 271


    I bought a Wilwood hanging pedal assembly. I now need to buy the master cylinders for the front and rear brakes. The front brakes are disk (GM calipers from Riley Automotive) and operate off of one master cylinder. The rear brakes are Ford 11" drums on a Ford 9" rearend. Does anybody have any experience with choosing a bore size for each of these master cylinders? They seem to start at .75" dia and go up to 1.125" dia. bore. Any suggestions on what size(s) I should purchase?
  2. Mattilac
    Joined: Oct 27, 2007
    Posts: 1,145


    I went with a 15/16" bore for my manual disc/drum brakes. Works great.
  3. seb fontana
    Joined: Sep 1, 2005
    Posts: 6,915

    seb fontana
    from ct

    What is the pedal assembly, two or three master cyl?
  4. mosimpson
    Joined: May 29, 2006
    Posts: 271


    Three master cylinders, I have a clutch. For the clutch I have purchased a .75" dia. master cylinder. Any experience with sizing master cylinders for brakes?

  5. 53sled
    Joined: Jul 5, 2005
    Posts: 5,818

    from KCMO

    I stick to what they came with. 1" was used by GM for manual disc/drum. 1 1/8 for power. How do you proportion the two separate systems? Balance bar?
  6. rd martin
    Joined: Nov 14, 2006
    Posts: 2,448

    rd martin
    from indiana

    4 builds, all 4 disc ,drum, used 15/16 bore from torino , early mustang, if your going manual, not power. got at napa
  7. wingman9
    Joined: Dec 30, 2009
    Posts: 804

    from left coast

    Your best bet is to call Wilwood. 805-388-1188
  8. thegrobe
    Joined: May 20, 2010
    Posts: 14


  9. Had a similar question but with drums front and back. Buying the Wilwood cylinder from Speedway so emailed the tech line and got the answers I needed.
    Wingman is right, Wilwood will know.

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