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When should you use the parking brakes and air brakes at the same time?

A Never
Never try to apply the brake pedal when the spring brakes are on. The combined force of the springs and the air pressure could damage the brakes. However, the brake systems on some (but not all) vehicles are designed to prevent this from happening.
B When you're preparing to pull your vehicle out of a parking space
C When you're preparing to park your vehicle