Adjustable Proportioning Valve Install

Brakes, Steering & Suspension

  1. 1968rt

    1968rt Well-Known Member

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    Can you install an adjustable proportioning valve towards the rear of the car before the axle? Ive heard when mounted in front, the brake light tends to come on. Also I would like to hide it.
     
  2. 493 Mike

    493 Mike FBBO Gold Member FBBO Gold Member

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    Sure. The master cylinder doesn't know where your placed it. The brake lights in most of our cars are actuated by a mechanical switch near the brake pedal so, once again, the brake light switch doesn't know where the P. valve is located.
    Mike
     
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    • 1968rt

      1968rt Well-Known Member

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      Im sorry I didnt clarify. I meant the dash brake light comes on. I heard the proportion valve installed up front affects the switch at the block.
       
    • Sixpactogo

      Sixpactogo Well-Known Member

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      The dash light should only light up when there is an imbalance between the front and rear brakes. It tells you that there is an issue in the proportioning valve. If you relocate it towards the rear, you will have to lengthen the wire between the valve and light. As Mike said, The system really don't care where you mount it.
       
    • 4mulas

      4mulas Well-Known Member

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      I’d want to keep debris out of the valve and adjustment knob etc. Not as easily adjusted if you have to stop and Jack up your car and crawl under it to make a change? Unless maybe you put it in the trunk, that might be cool.

      Your brake light shouldn’t come on unless you have a complete loss in pressure regardless of where you put it.
       
    • Sixpactogo

      Sixpactogo Well-Known Member

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      Not so. It will tell you of an imbalance in pressure. Such as possibly one of your rear cylinders leaking. It warns you that something needs attention.
       
    • 4mulas

      4mulas Well-Known Member

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      I’ve used them and I have to disagree.. there is no way it could check an imbalance of pressure of a wheel cylinder side to side, especially the rear as there is one line that feeds both. It would read as lower pressure on the one main line that feeds both.
       
    • Sixpactogo

      Sixpactogo Well-Known Member

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      It does not look for an imbalance between side to side cylinders. Only front to rear. The switch monitors pressure between the front and rear brakes and when there is an imbalance caused by a leak. If you have drum brakes all around, you have a distribution block instead of a proportioning valve but it has the same imbalance switch. It only turns the light on when the switch moves off of center to one end or the other. When that happens, it sends a path to ground and turns the light on telling you there is a problem with either your front brakes or the rear brakes. If you look at the make-up of either the proportioning valve or the distribution block you will see what I mean.
      The adjustable proportioning valve only adjusts pressure between the front and rear brakes.
       
    • mopar jack

      mopar jack Well-Known Member

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      Have mine located under car at drivers seat for easy in car adjustment. No problems with any brake lights and not noticeable with carpet pulled over and door closed.

      20201221_094318.jpg
       
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      • tallhair

        tallhair Rufus "Mod-hair" Firefly Staff Member

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        Nifty idea
         
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