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2004 fl80. Air brake question.

Discussion in 'Freightliner Forum' started by B77, Aug 5, 2020.

  1. Aug 5, 2020 #1
    B77

    B77 Light Load Member

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    56428F0A-0BB4-4008-A9BF-F0E9CD52E1F5.jpeg 56428F0A-0BB4-4008-A9BF-F0E9CD52E1F5.jpeg The tandem deck truck. Has (see pics) this foot pedal valve. ( just single way, yellow button) now I want to make a tractor out of this truck. So adding the red button and his protection valve. Is that possible with this foot pedal valve?
     

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    B77, Aug 5, 2020
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  3. Aug 5, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Should be. Pretty much all trucks use the same treadle valve. You're just needing to plumb a line in to go to the gladhand.


    This is a very bare-bones, generic breakdown of an FMVSS Schedule 121 braking system. It should give you a very rough idea of how the basic system is connected.
    018315941_1-d378041b9678717792ddf79b45f86243.png
     
    AModelCat, Aug 5, 2020
    AModelCat, Aug 5, 2020
    #2
    B77 Thanks this.
  4. Aug 5, 2020 #3
    B77

    B77 Light Load Member

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    So 21 would be the trailer protection valve?
     
    B77, Aug 5, 2020
    B77, Aug 5, 2020
    #3
  5. Aug 6, 2020 #4
    AModelCat

    AModelCat Road Train Member

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    Tractor protection valve
     
    AModelCat, Aug 6, 2020
    AModelCat, Aug 6, 2020
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    B77 Thanks this.
  7. Aug 6, 2020 #5
    B77

    B77 Light Load Member

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    Any chance you know from which line I can use?
     
    B77, Aug 6, 2020
    B77, Aug 6, 2020
    #5
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