What happens when there is air loss in either circuit of a dual air brake system?

In a dual air brake system, the design ensures that each circuit operates independently. This redundancy is a critical safety feature that allows the vehicle to maintain brake functionality even if one circuit loses air pressure. If there is a failure in one circuit, the other circuit remains operational, enabling the driver to have some level of control and stopping power.

This independent operation means that in the event one circuit suffers from air loss, the vehicle does not lose braking ability entirely, which is essential for safety. The system is engineered to support this function, allowing for continued braking capacity, minimizing the risk of complete brake failure.

Other options involve scenarios that do not accurately represent how dual air brake systems work. For instance, if both circuits were to fail simultaneously, that would lead to a dangerous situation, but the design specifically aims to prevent such a total failure from occurring during normal operation. This design aspect is crucial for maintaining vehicle safety on the road.