Why is periodic testing of the air brake system important?

Answer: B — To ensure all components are functioning properly

Periodic testing of the air brake system is crucial because it ensures that all components are functioning properly. This proactive approach helps identify any potential issues before they lead to system failures, thereby enhancing safety for passengers and preventing costly repairs or accidents. Regular testing can reveal the condition of various elements such as air compressors, brake chambers, and hoses, allowing technicians to address any wear or malfunction immediately. This maintenance practice helps maintain the reliability and effectiveness of the braking system, which is vital for safe vehicle operation.