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Thread: PA-12 master cylinder leaking

  1. #1

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    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

    thanks

  2. #2
    Steve Pierce's Avatar
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    Mar 2002
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    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. https://www.univair.com/search.php?s...linder&Search=
    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
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    Mar 2008
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    The STC for amphib floats requires high pressure master cylinders.
    N1PA

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