What is the function of a dual braking system?

A dual braking system is designed primarily to enhance safety by providing redundancy in braking capabilities. In this system, if one brake system were to fail, the other system can still function, allowing the driver to maintain control of the vehicle and stop safely. This is especially important for commercial vehicles, which often carry heavy loads and require reliable braking performance.

When discussing the other options, the option that mentions improving passenger comfort does not capture the primary safety function of a dual braking system. Additionally, while providing additional power to brakes under load may be beneficial, that is not the main purpose of having dual braking. Finally, the mention of assisting in automatic gear shifting is unrelated to the braking system's function; braking systems focus solely on slowing down or stopping the vehicle, rather than impacting gear shifts.

Overall, the correct answer highlights the importance of safety and reliability in vehicle braking systems.