Manitoba Airbrake Practice Exam

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What is the purpose of the tractor protection valve?

  1. Improves braking efficiency

  2. Increases air pressure

  3. Prevents total air loss from the tractor if the trailer breaks away

  4. None of the above

The correct answer is: Prevents total air loss from the tractor if the trailer breaks away

The purpose of the tractor protection valve is to prevent total air loss from the tractor in case the trailer breaks away. This valve automatically disconnects the trailer's brake system from the tractor's air supply, preventing a complete loss of air pressure and allowing the driver to bring the vehicle to a controlled stop. Option A is incorrect because the tractor protection valve does not directly improve braking efficiency. Option B is incorrect because the valve is not designed to increase air pressure. Option D is incorrect because the tractor protection valve does serve a specific purpose in the safe operation of a tractor-trailer.

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