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What role does the governor play in the air brake system of a vehicle?

  1. Regulates fuel injection

  2. Controls engine temperature

  3. Starts and stops air compressor

  4. Monitors tire pressure

The correct answer is: Starts and stops air compressor

The governor plays a crucial role in the air brake system of a vehicle by regulating the air compressor that controls the brakes. This ensures that the brakes are properly pressurized and allows the driver to safely slow down and stop the vehicle. While options A, B, and D may be important aspects of a vehicle's functionality, they do not directly pertain to the air brake system and are therefore incorrect. The governor's main responsibility is to maintain air pressure in the brake system, making option C the most accurate answer choice.