2014 Mack Pinnacle Brake Issue

Discussion in 'Mack Forum' started by Joe C123, Jan 25, 2021.

  1. Joe C123

    Joe C123 Bobtail Member

    Jan 25, 2021
    I have a problem that I have never heard of before. I'm Bobtailing at the moment, and I have a very odd problem with my truck brakes. At first I thought they were locked up from just sitting, but I have realised sense then that if I push in the truck parking brake and the trailer air supply, and then pull the trailer air supply back out, the brakes release and I can move the truck. I know how to work on simple things, but this is something that I have never heard of before, even the mechanic I called out wasn't sure what could be causing this. Any help is greatly appreciated.
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