Red Seal Truck and Transport Mechanic Practice Exam

What is the role of a governor in a truck's air brake system?

1. To control the speed

2. To maintain air pressure

3. To monitor engine temperature

4. To regulate fuel flow

The correct answer is: To maintain air pressure

The role of a governor in a truck's air brake system primarily involves maintaining air pressure. This component is crucial for the functioning of the air brake system because it ensures that there is an adequate and consistent supply of compressed air available to apply the brakes when needed. When the air pressure in the system drops below a certain threshold, the governor automatically engages the compressor to refill the air tanks. Conversely, once the tanks reach the desired pressure, the governor will prevent the compressor from overcharging the system. This regulation is essential because proper air pressure is critical for the effective operation of air brakes, ensuring safety and reliability in braking performance. Other roles mentioned, such as controlling speed, monitoring engine temperature, or regulating fuel flow, do not pertain to the operation of the air brake system. These functions are typically managed by different components or systems within the vehicle, highlighting the specific and vital function of the governor in air brake maintenance.