Mack CL700 trailer air supply valve

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

  1. MurphyT

    MurphyT Bobtail Member

    3
    0
    Jan 13, 2020
    0
    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?
     
  2. Dave1837

    Dave1837 Light Load Member

    132
    206
    Nov 16, 2019
    Pennsylvania
    0
    How much air are you losing when the parking and trailer brake valves are pushed in?
     
  3. MurphyT

    MurphyT Bobtail Member

    3
    0
    Jan 13, 2020
    0
    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.
     
  • Draft saved Draft deleted