What is the function of the parking brake?

The primary function of the parking brake is to keep the vehicle stationary when it is parked. This is crucial for preventing unintended movement, especially on inclines or slopes where gravity could cause the vehicle to roll. The system is designed to engage when the vehicle is not in motion and is typically a mechanical brake system separate from the vehicle's primary braking system.

In essence, when a vehicle is parked, the parking brake is engaged to ensure it remains securely in place, regardless of the terrain it is on. This is particularly important for safety, as it helps prevent accidents that could occur if the vehicle were to roll away.

The other choices relate to the operational aspects of the vehicle while in motion, where functions like slowing down, stopping quickly, or making emergency stops are performed by the main braking system rather than the parking brake.