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  • Brake Proportioning Valve

    Gentlemen,
    How can you tell if your brake proportioning valve is out of whack?
    I will get right to it.
    Before; rear tires would lock up under hard braking.
    After; no rear tire lock up. Car brakes like a anti-lock system but without the pulsing pedal feel.
    Regular driving is unaffected, until, I have to avoid running a stoplight. Then the brakes kind of fade but the car stops. The master cylinder and booster are in good shape.
    Thoughts?
    I have been driving this way for awhile. I just try to avoid the heavy,high speed braking.
    78 Cutlass Supreme
    Drive it everyday!
    sigpic

  • #2
    Could also be a kink but in your case it's probably unlikely.
    Sounds like your Prop. valve is out of whack, the valve could be jumping around causing this.
    A new Proportioning Valve isn't much, you could grab one from the bone yard but I wouldn't take chances on one...
    Lightning Rods repair service:CLICK HERE
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    1988 H/OCA Advisor
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    • #3
      Is this an item that should be bought from GM or are the aftermarket ones durable?
      Thanks,
      78 Cutlass Supreme
      Drive it everyday!
      sigpic

      Comment


      • #4
        Cannot be purchased from GM anymore, at least the original stock type can't. They may have a replacement though...
        I've seen some decent aftermarkets on eBay.
        Lightning Rods repair service:CLICK HERE
        Seller Feedback:CLICK HERE
        1988 H/OCA Advisor
        88 H/O #1 of 4
        88 CSC White/Claret - T-tops
        88 H/O Triple Black
        87 442 Black/Gray - T-tops
        85 442 White/Blue - T-tops
        85 442 White/Blue - T-tops
        85 442 White/Claret - T-tops
        85 442 White/Sage
        84 H/O Aero Commemorative #2199 - Sunroof
        83 H/O #2400 Sand Gray - Sunroof
        83 H/O #1607 Sand Gray - T-tops
        83 H/O #727 Maple
        "Keep them Rockets lit!"

        Comment

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