What type of inspection should be performed after performing major repairs on an air brake system?

After performing major repairs on an air brake system, it is essential to conduct a functional test. This type of inspection verifies that the air brake system operates correctly under normal working conditions. The functional test involves assessing the system's performance, ensuring that all components, such as the compressor, valves, and actuators, are working together effectively. It checks for proper brake engagement and release, responsiveness, and any potential leaks in the system. A functional test is crucial because it confirms that the repairs made have restored the system to safe and efficient operation.

While a visual inspection may identify obvious issues or loose components, it does not adequately confirm the operational integrity of the air brake system. A system pressure test focuses on measuring air pressure but does not evaluate the actual functioning or responsiveness of the brakes themselves. Similarly, a component clearance check is important for ensuring proper spacing and function of individual parts but falls short in assessing the complete functionality of the system as a whole. Thus, the functional test is the key inspection that guarantees the air brake system's safety and reliability after major repairs.