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Trailer air backpressure

Discussion in 'Trucks [ Eighteen Wheelers ]' started by ColumbiaBoB, Jul 22, 2016.

  1. Jul 22, 2016 #1
    ColumbiaBoB

    ColumbiaBoB Light Load Member

    188
    21
    May 3, 2011
    Des Moines, IA
    0
    Hi, once i apply brakes on my trailer there is back pressure on red gladhand, other than that everything works. Does anyone know what could be the problem. Thx
     
    ColumbiaBoB, Jul 22, 2016
    ColumbiaBoB, Jul 22, 2016
    #1
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  3. Jul 22, 2016 #2
    boneebone

    boneebone Road Train Member

    2,297
    2,371
    Mar 13, 2009
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    It could be a bad trailer valve on the trailer or a bad brake chamber.
     
    boneebone, Jul 22, 2016
    boneebone, Jul 22, 2016
    #2
  4. Jul 22, 2016 #3
    AModelCat

    AModelCat Road Train Member

    29,416
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    Jul 7, 2015
    Canuckistan
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    Once you pop the red knob to set your trailer brakes, all the air in your supply line should exhaust out of that valve. Try and set just the trailer brakes and see if you can hear air exhaust out that valve. IIRC the exhaust port of those park valves should remain open anytime you set the brakes. I'm thinking maybe your exhaust port/hose from the trailer park valve is restricted causing the air not to exhaust or to exhaust slowly.
     
    AModelCat, Jul 22, 2016
    AModelCat, Jul 22, 2016
    #3
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