What does a dual air brake system consist of?

The dual air brake system is designed to enhance the safety and reliability of brake operations in heavy vehicles. It consists of two sets of brake systems that can operate independently, ensuring that if one system fails, the other can still function effectively. This redundancy is critical in maintaining vehicle control and preventing accidents.

The correct choice reflects that the dual system is managed through a single set of brake controls, which coordinate between the two distinct air brake systems. This design allows for more efficient operation and minimizes the risk of brake failure, enhancing overall safety for the driver and other road users.

In contrast, the option about relying solely on hydraulic pressure is not applicable since dual air brake systems specifically utilize air pressure for operation. Additionally, the notion of one air tank supplying both systems is misleading, as dual air brake systems typically feature separate air tanks to ensure independence.