Practice question

What happens if you accidentally cross (swap) the blue service line and red emergency line glad hands when coupling?

  1. The tractor engine will run backwards
  2. Air will not release the trailer spring brakes, or pressing the foot brake will send full supply air to trailer tanks instead of service brakes
  3. The trailer headlights will turn pink
  4. The radio will lose all preset stations

Answer: B — Air will not release the trailer spring brakes, or pressing the foot brake will send full supply air to trailer tanks instead of service brakes

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