Final answer:
In air brake equipped vehicles, you should use the parking brake every time you park the vehicle.
Step-by-step explanation:
When do you use the parking brake in air brake equipped vehicles?
In air brake equipped vehicles, you should use the parking brake every time you park the vehicle. The parking brake is an important safety feature that helps to prevent the vehicle from rolling away when it is parked. It should be engaged whenever the vehicle is parked, even if the vehicle is on a flat surface.