Which part of the truck is the air compressor connected to? Before you start the test, please answer the question below regarding your insurance status. Without insurance you will not be able to drive in Ohio Do you currently have car insurance? Yes I have insurance. Great, you're all set! Click here if you still want to compare rates. No, I need insurance and I want to compare options. 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. This questions appears in the following tests: Minnesota Class B Knowledge Test Minnesota Passenger New Jersey Class B Knowledge Test New Jersey Air Brakes Tennessee Air Brakes West Virginia Air Brakes