Michigan CDL - Air Brakes Practice Exam

What does the air compressor governor control in an air brake system?

1. When the brakes are applied

2. When the air compressor pumps into storage tanks

3. The speed of the vehicle

4. The temperature of the brakes

The correct answer is: When the air compressor pumps into storage tanks

The air compressor governor plays a crucial role in the operation of an air brake system by controlling when the air compressor pumps air into the storage tanks. This is essential because the air brake system relies on compressed air stored in tanks to function effectively. The governor monitors the air pressure in the storage tanks and determines when to engage the compressor to refill them. When the pressure drops to a set lower limit, the governor activates the compressor to build the pressure back up to a predetermined higher limit. This automatic control ensures that there is always enough compressed air available for the brake system to operate properly, which is vital for the safety of the vehicle and its occupants. This function helps maintain the efficiency of the air brake system and prevents the compressor from running continuously, which could lead to overheating and excessive wear. Understanding this function is essential for proper vehicle maintenance and safe operation of vehicles equipped with air brakes.