Question When leaving your vehicle: Answers The air brakes should be applied. The parking brake should be applied. Brakes should not be applied if the vehicle is left out of gear. Explanation Parking brakes should be used whenever you park. If necessary, chock your wheels. Take a FREE Practice Test Now This questions appears in the following tests: Iowa Knowledge Test Class A , New Mexico Knowledge Test Class A , Vermont Knowledge Test Class A , Wisconsin Knowledge Test Class A , Michigan Double , Idaho Tank , Oklahoma Tank ,