What is one critical use of the parking brake?

The parking brake is primarily designed to keep a vehicle stationary when it is parked. This is crucial for safety, especially when the vehicle is on an incline or decline. By engaging the parking brake, you prevent the vehicle from rolling away, which could lead to accidents or property damage. It ensures that the vehicle remains fixed in place, providing peace of mind to the driver and ensuring compliance with safety regulations.

When considering the other options, while the parking brake may provide some assistance in emergency situations or slope changes, its main function is specifically to secure the vehicle when parked. Additionally, it does not assist with starting the engine, as that is typically managed by the vehicle’s ignition system.