Question On a truck with air brakes, the braking system’s air compressor: Answers Pumps air into the air storage tanks. Fills the tires. Moves air to the back of the truck. Cleans the brakes. Explanation In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor. Take a FREE Practice Test Now This questions appears in the following tests: Kansas Knowledge Test Class A , Montana Knowledge Test Class B , Texas Knowledge Test Class B , Utah Air Brakes ,