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Crown Dual Master Cylinder

Discussion in 'Early CJ5 and CJ6 Tech' started by Mark Andrews, Sep 6, 2019.

  1. Sep 6, 2019
    Mark Andrews

    Mark Andrews New Member

    Aug 24, 2017
    On a Crown JO945556 dual master cylinder (67-70 CJ5), which port is for the front brakes, and which for the rear brakes?? Crown tech support doesn't know. "We only duplicate an original part, without knowing it specific functions". This is supposedly the duplicated Wagner-Lockheed original. Thank you.
  2. Sep 7, 2019
    Rick Whitson

    Rick Whitson Detroit Area 2020 Sponsor 2019 Sponsor

    I live South of...
    Dec 2, 2014
    Welcome from Michigan. You will get an answer, I believe it is the back is the front and the front is the back. I am thinking about putting one on my 64 CJ 5, bought the right bracket, from a member, but have not done the job as of yet. I want to put 11" brakes on the front first. I have all the parts probably will do the job this winter. Good Luck
  3. Sep 9, 2019

    jzeber Well-Known Member 2019 Sponsor

    Morgan Hill, Ca
    Nov 15, 2003
    This is correct. Rear port to front brakes and front port to rear brakes.
    From a while back when I first did this conversion, post #42 on page 3. D27 Disc brake swap on my 71'

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