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Mack CL700 trailer air supply valve

Discussion in 'Mack Forum' started by MurphyT, Jan 13, 2020.

  1. Jan 13, 2020 #1
    MurphyT

    MurphyT Bobtail Member

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    Jan 13, 2020
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    I'm having an issue with the red trailer air supply valve not staying engaged. I can hold it in and the trailer pressurized well. Once the trailer is pressurized then the yellow valve won't stay engaged either. Any ideas?
     
    MurphyT, Jan 13, 2020
    MurphyT, Jan 13, 2020
    #1
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  3. Jan 22, 2020 #2
    Dave1837

    Dave1837 Road Train Member

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    How much air are you losing when the parking and trailer brake valves are pushed in?
     
    Dave1837, Jan 22, 2020
    Dave1837, Jan 22, 2020
    #2
  4. Jan 22, 2020 #3
    MurphyT

    MurphyT Bobtail Member

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    Jan 13, 2020
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    We finally got the problem figured out. There were two hoses switched around on a valve mounted under the hood on the firewall and one of them was kinked. Frustrating problem but an easy fix.
     
    MurphyT, Jan 22, 2020
    MurphyT, Jan 22, 2020
    #3
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