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  1. #1

    Default Brake Proportioning Valve Pressure Switch

    Does anyone sell replacements for the pressure switch that threads into the prop valve (83 GT). I can't find it listed anywhere. What is the proper name for it? Maybe it is listed somewhere I just don't know how they identify it. Mine is apparently leaking.

  2. #2
    FEP Senior Member Lubner's Avatar
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    If your switch is leaking its your o rings inside of proportioning valve leaking internally. Fluid is not suppose to be in that part of the valve. Rebuild the valve if its not to corroded internally.
    1979 Ghia Coupe
    5.0/C4
    Polar White
    1981 Cobra
    Gen 2 Coyote/6R80
    Bright Bittersweet
    2022 Mustang GT
    10r80 Whipple
    Eruption Green

  3. #3
    FEP Senior Member tbirdman's Avatar
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    Are you talking about the warning switch?...

    https://www.ebay.com/itm/NOS-1979-19...IAAOSwlElfzDT3
    If they take my stapler, then I'll set the building on fire...

    85 Mustang GT

  4. #4

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    Quote Originally Posted by tbirdman View Post
    Are you talking about the warning switch?...

    https://www.ebay.com/itm/NOS-1979-19...IAAOSwlElfzDT3
    That is it.

  5. #5

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    Quote Originally Posted by Lubner View Post
    If your switch is leaking its your o rings inside of proportioning valve leaking internally. Fluid is not suppose to be in that part of the valve. Rebuild the valve if its not to corroded internally.
    The front of the prop valve has been gutted for the rear disc changeover. I cannot remove the actuator at the rear with the o rings you are talking about, so I assume it is corroded. Pretty much tried everything I could and it won't budge. Based on what you are saying and since the car has the Ford Performance adjustable prop valve on it, I'm thinking my best move is to remove the original prop valve/distribution block altogether.
    I will lose the pressure diff alarm function, but the car has 93 cobra master cylinder, so I think I can wire the low fluid alarm switch from that to the place the existing pressure diff alarm went. Not quite the same, but about the best I can do it the original prop valve/distribution block is screwed.
    Can't I just remove it at this point and tie the rear lines together with a straight union and the fronts with a three way union?
    Last edited by mustangwolf; 01-01-2021 at 09:17 PM.

  6. #6
    FEP Senior Member Lubner's Avatar
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    Yes you can just remove it if your using manual proportioning valve.
    1979 Ghia Coupe
    5.0/C4
    Polar White
    1981 Cobra
    Gen 2 Coyote/6R80
    Bright Bittersweet
    2022 Mustang GT
    10r80 Whipple
    Eruption Green

  7. #7

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    Quote Originally Posted by Lubner View Post
    Yes you can just remove it if your using manual proportioning valve.
    thanks for the help!

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