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Thread: 87 MM - am I supposed to not have power brakes?

  1. #1

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    87 MM - am I supposed to not have power brakes?

    My brakes work fine with no spongy pedal, but if I want to stop I really have to PUSH on that pedal. It feels like I dont have power brakes or something. Is this normal, or has something gone bad?

  2. #2

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    I had that issue on the 1986 4wd & it was the load sensing proportioning valve (the thing with the spring behind the gas tank) the 1983 4wd does NOT have an LSPV & stops far better...hmmmm

  3. #3

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    Also, be sure to check the vacuum line going into that master-cylinder thing on the firewall: that's the booster. If the vacuum line is clogged or detatched, it would certainly cause that problem.

    RRTT's experience reinforces a post I made not long ago: these trucks have designer problems, and new ones crop up all the time! It's great we have a place to pool that information.
    The greatest gift you have to give to the world is that of your own self~transformation.

  4. #4

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    Quote Originally Posted by ragragtimetime View Post
    I had that issue on the 1986 4wd & it was the load sensing proportioning valve (the thing with the spring behind the gas tank) the 1983 4wd does NOT have an LSPV & stops far better...hmmmm

    Was that something you could clean, or did it need to get replaced?

  5. #5

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    so...you press on the pedal & it depresses to "normal" level & it just doesn't stop til you reach the next town...Click image for larger version. 

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ID:	11540...i had to replace valve & spring. try adjusting first & see if any change occurs....then bleed...also verify lines are not clogged/collapsed anywhere else.

  6. #6

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    I'll take a look at my manual. I really hope nothing needs to get replaced. Where did you find your part of that is what is needed? I am not readily finding anything online.

  7. #7

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    bought mine from dealer....back in 1991...& its is for sale if you need it

  8. #8

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    Quote Originally Posted by ragragtimetime View Post
    bought mine from dealer....back in 1991...& its is for sale if you need it
    That is good to hear! Hang onto it and give me time to check mine out

  9. #9

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    Click image for larger version. 

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