During troubleshooting, what should an engineer check besides mechanical parts?

In troubleshooting air brake systems, it is essential to check air pressure levels because they are crucial for the proper operation of the braking system. The air pressure in the brake lines directly affects the performance and reliability of the brakes. Insufficient air pressure can lead to ineffective braking, resulting in safety hazards. Engineers must ensure that the air pressure is within specified limits to guarantee that the brakes engage and release as designed.

Mechanical parts are important, but without the correct air pressure, even well-functioning components might not perform correctly. This focus on pressure levels is foundational in both identifying potential issues and ensuring the system operates safely and effectively.