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brake pedal dead

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Trugo, Nov 16, 2018.

  1. Nov 16, 2018 #1
    Trugo

    Trugo Light Load Member

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    Dec 8, 2015
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    I just bought a 95 freightliner FLD not running and towed it home. Got it running but the brakes are stuck, it wont roll. The truck builds pressure air and leaks from the secondary air system but holds in operating range while running. The hand valve will engage. But the brake pedal doesnt work, it has no pressure and does nothing. I checked the brake pedal linkage and it is connected. Ive also noticed the brake lights are stuck on. What should I look for? Im thinking I need to look at the foot pedal air valve although Im not sure how it works or what lines do what. This attached picture shows the pedal valve.
     

    Attached Files:

    Trugo, Nov 16, 2018
    Trugo, Nov 16, 2018
    #1
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  3. Nov 16, 2018 #2
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Bet you the pedal is stuck on the floor or is at least partially applied.
     
    AModelCat, Nov 16, 2018
    AModelCat, Nov 16, 2018
    #2
    pushbroom and Fatboy42 Thank this.
  4. Nov 16, 2018 #3
    dumptruck89

    dumptruck89 Light Load Member

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    Feb 27, 2015
    MA
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    Check the plunger beneath the pedal, can almost guarantee that's your problem, dirt and moisture gets in there and binds up. Take it out clean it up lube it up and see if it solves your problem.
     
    dumptruck89, Nov 16, 2018
    dumptruck89, Nov 16, 2018
    #3
  5. Nov 16, 2018 #4
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Common to the FLD. On the firewall is the plunger that gets pushed in by your brake pedal. You need to take it apart and then get something to tap to plunger free.You can clean it and the bore up or buy new parts. When I cleaned mine up I always put a little anti-sieze compound on the plunger. It seemed to need it done again after a few years and seemed to only start screwing up during real cold temps.
     
    kemosabi49, Nov 16, 2018
    kemosabi49, Nov 16, 2018
    #4
    Rideandrepair, Dino soar and Fatboy42 Thank this.
  6. Nov 16, 2018 #6
    Trugo

    Trugo Light Load Member

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    Dec 8, 2015
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    Ok Thanks guys. I’ll take it apart and see.
     
    Trugo, Nov 16, 2018
    Trugo, Nov 16, 2018
    #6
  7. Nov 16, 2018 #6
    Fatboy42

    Fatboy42 Light Load Member

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    Feb 9, 2011
    Indiana
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    Had the same thing happen to my 352 in my avatar pb blaster work back and forth unstick take apart clean it up
     
    Fatboy42, Nov 16, 2018
    Fatboy42, Nov 16, 2018
    #6
  8. Nov 17, 2018 #7
    Rideandrepair

    Rideandrepair Road Train Member

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    They give squeak when it’s real cold!!! I think you hit the nail
     
    Rideandrepair, Nov 17, 2018
    Rideandrepair, Nov 17, 2018
    #7
  9. Nov 17, 2018 #8
    Trugo

    Trugo Light Load Member

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    Dec 8, 2015
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    Indeed it was a problem with the plunger as kemosabi49 said. Somebody had previously greased it which was now cement. I sanded everything smooth and this worked, the brakes released and the truck drives. Thanks.
     
    Trugo, Nov 17, 2018
    Trugo, Nov 17, 2018
    #8
    xsetra and Rideandrepair Thank this.
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