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No trailer break, pulling the knob does not engage the break!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Chris6360, Nov 10, 2018.

  1. Nov 10, 2018 #1
    Chris6360

    Chris6360 Bobtail Member

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    Nov 10, 2018
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    Can anyone help plz......
    When I pull the red knob my trailer breaks do not engage......any suggestions?
     
    Chris6360, Nov 10, 2018
    Chris6360, Nov 10, 2018
    #1
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  3. Nov 10, 2018 #2
    stillwurkin

    stillwurkin Road Train Member

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    Can you hook to a different trailer and test that one? Then you can tell if its tractor or trailer problem. I would start there.
     
    stillwurkin, Nov 10, 2018
    stillwurkin, Nov 10, 2018
    #2
    JohnC123 Thanks this.
  4. Nov 11, 2018 #3
    JohnC123

    JohnC123 Light Load Member

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    Jan 25, 2018
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    Unless your pulling an antique, trailer brakes are spring loaded and locked when air is dumped (pulling the red knob). The red and blue air lines connected to the trailer are the Emergency and Service air lines respectively, disconnect the red one (glad hand), the trailer brakes should lock unless some shenanigans are going on then re-post.
     
    JohnC123, Nov 11, 2018
    JohnC123, Nov 11, 2018
    #3
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