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When coupling a tractor and semi trailer and have connected the air lines, before backing under the trailer, you should:
When coupling a tractor and semi trailer and have connected the air lines, before backing under the trailer, you should:
  • Make sure the trailer brakes are disengaged.
  • Apply the brakes quickly and firmly.
  • Supply air to the trailer system and then pull out the air supply knob to lock the trailer brakes.
  • Apply the brakes twice to engage the automatic hitching system.