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What are these hoses?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by makterna, Feb 21, 2022.

Page 1 of 2
  1. Feb 21, 2022 #1
    makterna

    makterna Light Load Member

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    What are these silver and black air hoses? Lots of air is coming when I apply the brakes. Dont know if it is relevant but I just replaced the tractor protection valve. The reason for that being that air was coming out of the blue trailer hose, causing a honking noise, and the consensus in a truckers forum on Facebook was that the TPV needed to be replaced, so I did that.[​IMG] Before that I had a mechanic replace a fan actuator valve.
     
    makterna, Feb 21, 2022
    makterna, Feb 21, 2022
    #1
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  3. Feb 21, 2022 #2
    makterna

    makterna Light Load Member

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    makterna, Feb 21, 2022
    makterna, Feb 21, 2022
    #2
  4. Feb 21, 2022 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    I would start with tracing those lines to there source.
    Does it change with the parking brake set. Truck parking brakes released and or trailer parking brakes released?
     
    BoxCarKidd, Feb 21, 2022
    BoxCarKidd, Feb 21, 2022
    #3
    makterna Thanks this.
  5. Feb 21, 2022 #4
    Animosus

    Animosus Heavy Load Member

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    They just appear to be exhaust hoses for some of the valves. Probably have a bad valve somewhere.
     
    Animosus, Feb 21, 2022
    Animosus, Feb 21, 2022
    #4
    makterna Thanks this.
  7. Feb 22, 2022 #5
    makterna

    makterna Light Load Member

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    Thanks! The gray goes to the dash valve. Regardless of the position of the dash valves, lots of air come through the gray hose when pressing the foot brake.
     
    makterna, Feb 22, 2022
    makterna, Feb 22, 2022
    #5
  8. Feb 22, 2022 #6
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    What truck?
     
    Big Road Skateboard, Feb 22, 2022
    Big Road Skateboard, Feb 22, 2022
    #6
    makterna Thanks this.
  9. Feb 22, 2022 #7
    Antinomian

    Antinomian Road Train Member

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    I see DD15 fuel filters so most likely a Cascadia.

    Need to see which holes in the manifold they come through so I can compare it to mine.
     
    Antinomian, Feb 22, 2022
    Antinomian, Feb 22, 2022
    #7
    makterna and Big Road Skateboard Thank this.
  10. Feb 22, 2022 #8
    jamespmack

    jamespmack Road Train Member

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    Looks like exhaust.

    Anytime you have a back feed situation. Isolate truck from trailer. Identifying which unit is causing the issue. Start by pinching off brake chamber service lines one at a time. Brake chambers can backfeed from Parkside to Service with no audible air leak. This is completely free diagnostics.
     
    jamespmack, Feb 22, 2022
    jamespmack, Feb 22, 2022
    #8
    makterna and Big Road Skateboard Thank this.
  11. Feb 22, 2022 #9
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Big Road Skateboard, Feb 22, 2022
    Big Road Skateboard, Feb 22, 2022
    #9
    makterna Thanks this.
  12. Feb 25, 2022 #10
    makterna

    makterna Light Load Member

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    2011 Freightliner Cascadia sleeper.
     
    makterna, Feb 25, 2022
    makterna, Feb 25, 2022
    #10
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