Mack CL700 trailer air supply valve

Discussion in 'Mack Forum' started by MurphyT, 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?
     
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  3. 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?
     
  4. 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.
     
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