Question Which part of the truck is the air compressor connected to? Answers The transmission The engine The radiator The door latch Explanation In an air brake system, the air compressor is connected to the engine through gears or a v-belt. Take a FREE Practice Test Now This questions appears in the following tests: North Dakota Knowledge Test Class A , West Virginia Knowledge Test Class A , District Of Columbia Knowledge Test Class B , Mississippi Air Brakes , Wyoming Air Brakes ,