Practice question

Under the NJ MVC Commercial Driver License Manual air-brakes section, what does the stop-light switch in an air brake system do?

  1. It turns on the brake lights when air pressure is applied to the service brakes
  2. It activates the parking brake automatically
  3. It bleeds the supply tank
  4. It controls the trailer air

Answer: A — It turns on the brake lights when air pressure is applied to the service brakes

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Practice more: NJ CDL Air Brakes Test Practice Questions - New Jersey Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →