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During what stage should the air brake system typically be checked?

  1. Before loading the vehicle

  2. During routine maintenance

  3. After every trip

  4. Whenever a fault is suspected

The correct answer is: During routine maintenance

The optimal time to check the air brake system is during routine maintenance. This stage is systematic and allows for thorough inspections and necessary adjustments to ensure all components are functioning correctly. Routine maintenance typically follows a predetermined schedule based on time intervals, mileage, or operating conditions, ensuring that the air brake system remains reliable and safe over time. In this context, checking the air brake system during routine maintenance helps catch potential issues before they turn into serious problems that could endanger safety when the vehicle is in operation. It forms part of a broader service routine that may involve multiple components of the vehicle, not just the air brakes. While checks before loading, after every trip, and whenever a fault is suspected are all important practices, they do not replace the comprehensive evaluation given during routine maintenance, which is designed to maintain the vehicle's overall safety and efficiency on a regular basis.