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  1. simp5782

    M939A2 series dragging brake

    Front of the truck, below radiator on the bracket there. They usually go bad and vent to the stack with the pedal depressed but they are the activating equalizer valve for the front axle brakes. You can put a air pressure gauge rigged to the air lines to the chamber and see how long the...
  2. simp5782

    M939A2 series dragging brake

    They are all auto adjusting wedges. Remove the lines at each front and plug the sending line and see if it grabs. If it does cap off both front hoses and see if it does. If it doesn't then you have a Q2 valve or a treadle valve sticking. Treadle valves are known to slowly apply brakes while...
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