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Replacement Master Cylinder

Discussion in 'Early CJ5 and CJ6 Tech' started by colojeepguy, Nov 10, 2019.

  1. colojeepguy

    colojeepguy Colorado Springs

    Seems like we've discussed this before, but I can't find it now. I need a replacement master cylinder for my 70...this is the dual master cylinder with the bolt on lid. All the replacement listing show a bail type which isn't correct.
     
    colojeepguy, Nov 10, 2019
    #1
  2. liquids

    liquids Old Member

    liquids, Nov 10, 2019
    #2
  3. colojeepguy

    colojeepguy Colorado Springs

    Or the 937815.....
    :confused:
    Thanks for the tip though!
     
    colojeepguy, Nov 10, 2019
    #3
  4. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    FinoCJ, Nov 10, 2019
    #4
  5. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Twin2, Nov 11, 2019
    #5
  6. Gregory Plouff

    Gregory Plouff New Member

    Did you have to bench lead the master cylinder before installing it? To work properly
     
    Gregory Plouff, Apr 18, 2020
    #6
  7. colojeepguy

    colojeepguy Colorado Springs

    You should always bench bleed a master cylinder, there's quite a bit of air in there and trying to pump it out through the lines is not good.
     
    colojeepguy, Apr 18, 2020
    #7
  8. Gregory Plouff

    Gregory Plouff New Member

    OK thanks for the quick reply I will pull it back out.
     
    Gregory Plouff, Apr 18, 2020
    #8
  9. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    you can bleed it in place...use the pedal...just leave the brake lines disconnected from the ports and connect them back...helps to have a plug (which often comes with new MC).
     
    FinoCJ, Apr 18, 2020
    #9
  10. Gregory Plouff

    Gregory Plouff New Member

    I’ll give that a try. Will it blow the plug out?
     
    Gregory Plouff, Apr 18, 2020
    #10
  11. 1967 CJ5A

    1967 CJ5A Mike 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I wasn't impressed with the 945556 (Crown) master cylinder. It failed on me because an internal screw backed out, jamming up the mechanism and leaving me with no brakes, front or rear, with no warning.

    Pictures in this thread: Suzuki Disk Brake Conversion Mc

    I never ran across the 937815 MC from Willys Jeep Parts when I was searching. But it looks correct, is made in USA, and is substantially cheaper than the Crown unit. If I needed to buy one, I would give that a try.
     
    1967 CJ5A, Apr 18, 2020
    #11
  12. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Remove the plug to bleed...you will remove it to install the brake lines....
     
    FinoCJ, Apr 18, 2020
    #12
    Gregory Plouff likes this.