What does the parking brake do when applied?

The parking brake is designed specifically to prevent the ATV from rolling when it is parked. When applied, the parking brake ensures that the vehicle remains stationary, which is crucial for safety when stopping on inclines or uneven terrain. This mechanism is essential to prevent unintended movement that could lead to accidents or injuries.

In contrast, the other options do not accurately represent the function of the parking brake. It does not facilitate acceleration, engage the front wheel for steering, or activate any gear shifts; its primary role is to secure the ATV in a fixed position when parked.