Arizona Air Brakes CDL Practice Test

A dual air brake system...

1. Has two air brake systems and one set of controls

2. Takes less time to build air pressure

3. Has one set of air tanks and hoses

4. Must have two warning alarms

The correct answer is: Has two air brake systems and one set of controls

A dual air brake system consists of two separate air brake systems that operate independently but are controlled by a single set of controls. This redundancy is crucial for safety; should one system fail, the other can still operate effectively, ensuring that the vehicle can still be stopped safely. This design enhances reliability and increases the overall safety of the braking system in commercial vehicles. In contrast, the other options do not accurately describe the characteristics of a dual air brake system. While option B suggests that a dual system takes less time to build air pressure, the air pressure build-up time can vary based on several factors, including compressor efficiency and tank size, not solely on the system type. Option C incorrectly states that there is only one set of air tanks and hoses; in fact, a dual system comprises two separate air tanks to maintain independence in operation. Lastly, option D refers to warning alarms, which may not be a required feature specific to dual air brake systems, as the necessity for alarms depends on various regulatory standards rather than the operational design of the brakes themselves.