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Thread: PA-12 master cylinder leaking

  1. #1

    Join Date
    May 2021
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    PA-12 master cylinder leaking

    Looking for recommendations on purchasing, overhauling or changing existing master cylinders. 1946 PA-12 amphib


  2. #2
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Graham, TX
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    Where is it leaking? Does it have any brake? Is it stock, no booster? If stock and no brake it is probably the diaphragm.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers

  3. #3

    Join Date
    Sep 2003
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    I always carried spare diaphragms. After I discovered cap screws and ball end drivers I timed a diaphragm replacement -ten minutes including unlacing the seat sling. Of course I left out the bottom screw.

    Truck inner tube material lasted for about ten years - unless I let the fluid get low.

    All three Cubs are converted to Grove reservoir systems. Brake maintenance is now reduced to replacing pads annually.
    Likes Southern Aero liked this post

  4. #4
    skywagon8a's Avatar
    Join Date
    Mar 2008
    SE Mass
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    The STC for amphib floats requires high pressure master cylinders.

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