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Air comes out red line all time

Discussion in 'Freightliner Forum' started by Scottkelley, Apr 8, 2019.

Page 1 of 2
  1. Apr 8, 2019 #1
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    Why does air come out red line when disconnected worse when applying brake
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #1
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  3. Apr 8, 2019 #2
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    So nobody knows ?
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #2
  4. Apr 8, 2019 #3
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    This appears useless
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #3
  5. Apr 8, 2019 #4
    Goodysnap

    Goodysnap Road Train Member

    3,718
    9,024
    Jul 12, 2017
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    Impatient much?

    First why dont you start by telling us what your working on? Are you saying that air comes out the red trailer line all the time? Regardless of if the red knob is in?
     
    Goodysnap, Apr 8, 2019
    Goodysnap, Apr 8, 2019
    #4
    Working2party, AModelCat, mhyn and 1 other person Thank this.
  7. Apr 8, 2019 #5
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    Yes and it's a 91 fld
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #5
  8. Apr 8, 2019 #6
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    When applying the brake bobtailing all the air pressure comes out red line with very little stopping ability
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #6
  9. Apr 8, 2019 #7
    GypsyWanderlust

    GypsyWanderlust Medium Load Member

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    It sounds like you have a valve stuck open on the trailer emergency air supply. If you are bobtail the red knob is pulled out and no air should be coming from the red emergency line.
     
    GypsyWanderlust, Apr 8, 2019
    GypsyWanderlust, Apr 8, 2019
    #7
  10. Apr 8, 2019 #8
    Scottkelley

    Scottkelley Bobtail Member

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    Apr 8, 2019
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    So replace valve in dash?
     
    Scottkelley, Apr 8, 2019
    Scottkelley, Apr 8, 2019
    #8
  11. Apr 8, 2019 #9
    GypsyWanderlust

    GypsyWanderlust Medium Load Member

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    Jan 1, 2018
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    Your post is a bit vague. Is your red trailer air supply knob pulled out?

    This kind of feels like a troll post
     
    GypsyWanderlust, Apr 8, 2019
    GypsyWanderlust, Apr 8, 2019
    #9
    homeskillet Thanks this.
  12. Apr 8, 2019 #10
    cgarys

    cgarys Bobtail Member

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    Jan 27, 2011
    Pab City, Newfoundland
    0
    Check your Tractor Protection Valve.
     
    cgarys, Apr 8, 2019
    cgarys, Apr 8, 2019
    #10
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