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Thread: Brake Proportioning Valve

  1. #1
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    Default 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!

  2. #2
    Administrator 88hurstolds's Avatar
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    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...
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  3. #3
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    Is this an item that should be bought from GM or are the aftermarket ones durable?
    Thanks,
    78 Cutlass Supreme
    Drive it everyday!

  4. #4
    Administrator 88hurstolds's Avatar
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    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.

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