What must you do before shifting into reverse?

Before shifting into reverse, it is crucial to apply the brake. This action ensures that the vehicle remains stationary while you are preparing to change gears. Applying the brake prevents any unintended movement that could occur if the vehicle is in gear or if the gas pedal is accidentally pressed. It is a fundamental safety measure that helps establish control over the vehicle before executing the shift.

Checking mirrors, signaling intentions, and engaging the parking brake are also good practices, but the immediate priority when preparing to shift into reverse is to ensure the vehicle is secured and not moving, which is achieved by applying the brake.