What is the purpose of a vehicle's emergency brake?

The primary purpose of a vehicle's emergency brake, also known as a parking brake, is to keep the vehicle stationary when it is parked. This is especially important on inclines or declines to prevent the vehicle from rolling away. The emergency brake operates independently of the vehicle's main hydraulic braking system and is designed to act as a supplemental safety measure. In situations where the regular braking system fails or is disengaged, the emergency brake can provide an additional layer of security to maintain the vehicle's position.

Enhancing acceleration, assisting in overtaking, and reducing fuel consumption do not relate to the emergency brake's function. These aspects pertain to the vehicle's operational performance and control rather than its safety mechanisms for securing the vehicle when stationary.