2011 Cascadia Air loss on Brake application when BobTail

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wonderdog24, Jan 20, 2022.

  1. wonderdog24

    wonderdog24 Medium Load Member

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    Mar 1, 2012
    Puyallup,Wa
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    Coming out of my service line at back of cab when I apply brake pressure.. Also does the same thing with both valves set in the park position.. Any Ideas on what would cause this.. Leaning towards the Foot valve on the firewall.. Just not sure at this point
     
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  3. AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    Sounds like tractor protection valve might be sticking.
     
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