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Thread: Brake Proportioning Valve Rebuild?

  1. #1

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    Brake Proportioning Valve Rebuild?

    So the truck is just about road worthy. Was preparing for inspection and noticed the master brake cylinder was leaking, so the brakes were squishy. Swapped out, bled the system took it for drive and noticed they were better but not good. Climbed underneath and found moisture on the proportioning valve. Connections seem tight, so thinking rubber gasket failure.

    My question, since they are near impossible to find online has anyone attempted tearing it down to replace the internals?
    If so, any tips. I don't want to go this route and ruin the only one I have. Because I can't find a replacement.

    Thanks in advance.
    Last edited by Ram50-Newb; 08-29-2019 at 10:41 AM.

  2. #2

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    I removed mine from the truck when I replaced all of the brake lines. Mine was rusted solid. I have a single line running to the rear brakes. I put it in a few wheel locked stops when I first eliminated it to make sure that I wouldn't have a rear biased brake system. That can be bad, especially in rain or snow.
    I was going to try and find another and hook it back up at some point, but theres nothing more permanent than a temporary solution

  3. #3

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    Will a manually adjustable brake bias valve work? It should but I I'm asking just in case there's a practical reason why you wouldn't use one in this application.
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  4. #4

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    I'm curious on this matter as well...

    I know mine is the load-sensing version, but I know it's supposed to have a check valve in it for the rear drums and I doubt even that part is functioning.

  5. #5




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    a manual proportioning valve will work fine - you just have to remember to adjust it when the conditions when driving change, like empty to fully loaded.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

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    Quote Originally Posted by WarStryker13 View Post
    I'm curious on this matter as well...

    I know mine is the load-sensing version, but I know it's supposed to have a check valve in it for the rear drums and I doubt even that part is functioning.


    I now suspect I was incorrect about the rear drum brake check valve being part of the LSPV... But I can confirm, without a doubt, that my LSPV is 100% broken.

    I took another look at it and found out that the piston is no longer connected to the lever. The shaft and retaining nut is gone, snapped off right at the rubber boot. So now I'm going to have to search the junkyard for one or find a good used one for sale...

    There are new LSPVs available for the L200, and they look exactly like our LSPV, but I don't know if it would even bolt up.

  7. #7

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    Quote Originally Posted by WarStryker13 View Post
    I now suspect I was incorrect about the rear drum brake check valve being part of the LSPV... But I can confirm, without a doubt, that my LSPV is 100% broken...There are new LSPVs available for the L200, and they look exactly like our LSPV, but I don't know if it would even bolt up.
    If it's from the same generation of truck, it should be identical. Also cross check Mitusbishi Tritons as well as a reference.
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  8. #8

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    Warstryker, thanks for the tip. I found some on Amazon for the L200 for the 87. Ordered one and I am now waiting. If it works, I may still take the old one and tear it down. If it is easy to rebuild, I'll share here for others.

  9. #9

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    Pennyman / geezer - any preference or suggestions on the manual valve option? I like options

  10. #10

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    Sorry, I've got nada on this one. I'm planning a brake upgrade on my Gen 1 and have the calipers and front rotors waiting, but haven't looked at the rear end yet as I might be doing the LSD swap and want to hold off until I have a solid plan.
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