leversole Posted November 27, 2010 Share Posted November 27, 2010 Wondering what this is? One line comes from a service port on the treadle valve, the other goes to the column mounted trailer brake lever, and it has the brake switch. All of the diagrams I have show the column lever gets full air from the tank. Why would the trailer brake test valve get air only when the brake pedal is pressed? Confused...Thanks Quote Link to comment Share on other sites More sharing options...
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