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With air brake-equipped vehicles, the parking brakes should be used

A whenever you leave the vehicle unattended.
Explaination
Because air pressure can leak when you're away from your vehicle, it should be set with the parking brake, to keep it from rolling. There is an exception to this rule: if the brakes are too hot or wet, use wheel chocks instead, to avoid brake damage or freezing.
B as little as possible.
C only during pre-trip and post-trip inspections.