What distinguishes a dual air brake system?

A dual air brake system is characterized by its design, which separates the braking functions for improved safety and reliability. In this system, one part is dedicated to operating the front brakes while the other part operates the rear brakes. This separation ensures that if one system fails, the other can still maintain braking capability, significantly enhancing overall vehicle safety.

The distinction lies in the redundancy that a dual air brake system provides. By having two independent air brake circuits, drivers are better equipped to handle brake failure. This is particularly important in larger vehicles where the effectiveness of braking is crucial for safe handling and operating.

Other options, while they describe features that may be found in braking systems, do not accurately reflect the characteristics of a dual air brake system. For example, the option referring to a single storage tank does not apply since dual systems use multiple tanks. Additionally, a manual pump does not define a dual air brake system, which relies on an air compressor and reservoirs for operation rather than manual effort. Lastly, hydraulic pressure is not a characteristic of an air brake system; air brakes operate using compressed air rather than hydraulic fluid.