This socket is facing downward to ensure water does not get into the electrical line. Place the plug in the coupler on the back of the truck. For the electrical line, grab the plug and pull out of the trailer’s socket. Hook the a ir line on the tractor’s coupler. This will allow you to remove the air lines from the trailer. To release the air lines from the trailer, one at a time, grab the air line by the glad hand and push upward until it is at a 90° angle with the coupler. For the electrical line (green) there’s a plug. Unhooking the Electrical and Air LinesĮach truck has couplers for the emergency brake air line (red) and service brake air line (blue). Once the landing gear is down, move to the other side of the truck to unhook the electrical and air lines. Unhook the crank handle from under the trailer and turn the crank until the landing gear touches the ground. Lowering the landing gear is similar to raising it. Once you are satisfied with the surface under the trailer, start the uncoupling process by lowering the landing gear. Uncoupling on an uneven surface can damage the landing gear, 5 th wheel, and/or trailer. ![]() Look for and avoid potholes, large cracks, or soft ground. ![]() Lower the Landing Gearīefore uncoupling ensure trailer is on level ground that will support the weight of the trailer. Following the proper steps for uncoupling will protect the trailer and truck from preventable damage and keep you safe. There are several reasons a driver will need to uncouple from a trailer.
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