Yellow knob not staying pushed in

Discussion in 'Ask An Owner Operator' started by draya93, Sep 7, 2024.

  1. draya93

    draya93 Bobtail Member

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    Aug 25, 2021
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    Hey guys. Having an issue with my truck. Yellow dash valve won’t stay in or go in. Truck is bobtail and starting leaking thru the red gladhand if I leave my palm pushed in and if I let go,it won’t stay in. Gonna tackle it tomorrow but anyone have something similar happen? Or what to check for?
     
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  3. Long FLD

    Long FLD Road Train Member

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    Mar 4, 2015
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    Tractor protection valve? That’s my only guess.
     
    86scotty and flood Thank this.
  4. SomeCanadian

    SomeCanadian Light Load Member

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    Nov 11, 2021
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    I don’t recommend it but as a stop gap to replacement, on some models of brake release valves it is possible to replace a worn o-ring to solve the not staying in problem. (Was a former employer’s solution to hitting a bump and the brake setting while driving)
     
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