What is the function of the parking brake on the vehicle?

The primary function of the parking brake on a vehicle is to secure the vehicle when parked. It is a crucial safety feature that prevents the vehicle from rolling away when it is stationary. When engaged, the parking brake locks the rear wheels (or sometimes the front wheels, depending on the vehicle's design) to ensure stability, particularly on inclines or uneven surfaces. This mechanism is especially important for tactical vehicles like the JLTV, where stability in various terrains is vital.

Although other functions related to vehicle operation may be important, they do not relate to the parking brake's primary purpose. Enhancing fuel efficiency, controlling transmission fluid levels, or increasing engine power are functions associated with different components of the vehicle, such as the engine system, transmission, or performance tuning. The parking brake's role is distinctly focused on vehicle stability during stationary periods, making it an essential feature for safe operation.