Coupling: Step 2 - Air Lines, Electrical Line, and Landing ...
2017-1-10u2002·u2002The electrical and air lines need to be connected and the landing gear needs to be raised all the way up. Air and Electrical Lines. On the back of the truck, on the driver side, there are 3 lines: red, green, and blue. The red line is the air line for the trailer's emergency brake. The green line is …
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