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Replacement Master Cylinder

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

  1. Nov 10, 2019
    colojeepguy

    colojeepguy Colorado Springs 2019 Sponsor

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    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.
     
  2. Nov 10, 2019
    liquids

    liquids Old Member 2019 Sponsor

    Detroit-ish
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  3. Nov 10, 2019
    colojeepguy

    colojeepguy Colorado Springs 2019 Sponsor

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

    FinoCJ 1970 CJ5 Staff Member 2020 Sponsor

    Denver, CO
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  5. Nov 11, 2019
    Twin2

    Twin2 not him 2020 Sponsor 2019 Sponsor

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  6. Apr 18, 2020
    Gregory Plouff

    Gregory Plouff Member

    Fraser MI
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    Did you have to bench lead the master cylinder before installing it? To work properly
     
  7. Apr 18, 2020
    colojeepguy

    colojeepguy Colorado Springs 2019 Sponsor

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    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.
     
  8. Apr 18, 2020
    Gregory Plouff

    Gregory Plouff Member

    Fraser MI
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    OK thanks for the quick reply I will pull it back out.
     
  9. Apr 18, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member 2020 Sponsor

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    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).
     
  10. Apr 18, 2020
    Gregory Plouff

    Gregory Plouff Member

    Fraser MI
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    I’ll give that a try. Will it blow the plug out?
     
  11. Apr 18, 2020
    1967 CJ5A

    1967 CJ5A Mike

    Raleigh, NC
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    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.
     
  12. Apr 18, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member 2020 Sponsor

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    Remove the plug to bleed...you will remove it to install the brake lines....
     
    Gregory Plouff likes this.

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