What is a dual air brake system?

A dual air brake system refers to a design in which there are two separate air brake systems that operate using a single set of brake controls. This setup enhances the safety and functionality of the braking system. If one air brake system fails, the other can still function, providing a backup that allows the driver to maintain control of the vehicle.

In typical dual air brake systems, one system is responsible for the front brakes and the other for the rear brakes. Utilizing a single set of brake controls simplifies the driver's operation while still ensuring that both systems work together to provide effective braking. This is critical in large commercial vehicles, where braking performance is essential for safety.

The other options present different configurations. Having one system for brakes and another for steering would not be efficient or practical, as brakes and steering operate independently. Two separate systems using a dual pedal is not accurate as it suggests a complexity that dual systems do not require; they are designed to work in tandem with common control mechanisms. Lastly, describing it as one system with enhanced braking power misses the essential element of redundancy and the use of separate systems.