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Air build up in emergency line on trailer

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitmaks, Jul 2, 2025.

  1. Jul 2, 2025 #1
    mitmaks

    mitmaks Road Train Member

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    I've noticed that once I've set brakes on trailer and went to unhook the emergency air line there was a ton of air pressure. I've never had it happen before.
    Once I've disconnected the air line there was air flowing out of gladhand on the trailer for like 20-30 seconds. Something on the trailer broke for it to backflow like that?
     
    mitmaks, Jul 2, 2025
    mitmaks, Jul 2, 2025
    #1
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  3. Jul 2, 2025 #2
    Tb0n3

    Tb0n3 Road Train Member

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    There's some valving that should keep that from happening. Should allow building air in the trailer tanks but not back feed. Yes there's something wrong with the trailer.
     
    Tb0n3, Jul 2, 2025
    Tb0n3, Jul 2, 2025
    #2
    mitmaks Thanks this.
  4. Jul 3, 2025 #3
    kwswan

    kwswan Road Train Member

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    Your quick release valve on the trailer is bad.
     
    kwswan, Jul 3, 2025
    kwswan, Jul 3, 2025
    #3
    little cat 500, Tb0n3 and mitmaks Thank this.
  5. Jul 3, 2025 #4
    mitmaks

    mitmaks Road Train Member

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    Is it easy to replace myself or needs specialty tools etc
     
    mitmaks, Jul 3, 2025
    mitmaks, Jul 3, 2025
    #4
  7. Jul 3, 2025 #5
    nikmirbre

    nikmirbre Road Train Member

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    High Point NC
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    Its a valve that should be located near one of your front brake chambers....... no specialty tools needed. Just make sure you put the hoses back in the correct holes they came out of.
     
    nikmirbre, Jul 3, 2025
    nikmirbre, Jul 3, 2025
    #5
    mitmaks Thanks this.
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