What method can test if air flows to all trailers?

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The method of opening the emergency line shut-off valve to check for air escape is effective for determining if air flows to all trailers because it directly assesses the functionality of the air supply system. When the emergency line shut-off valve is opened, if air escapes, this indicates that air is indeed present and flowing through the lines to that trailer. This method provides immediate feedback on whether the air supply is reaching all connected trailers and allows for troubleshooting if necessary.

Other methods may not be as conclusive for testing airflow. For instance, if air pressure is allowed to build before checking, it might not accurately indicate whether all trailers are receiving sufficient air, as the pressure could be retained in the working trailer lines without reflecting any issues in the supply system. Using a pressure gauge on each trailer would require individual readings and might not offer insights on the overall functionality of the air system across multiple trailers simultaneously. Lastly, a visual inspection of the air lines can identify obvious physical issues such as damage or leaks but cannot definitively confirm whether air is flowing properly through all connections. Hence, opening the emergency line shut-off valve is a practical and direct approach for this particular assessment.

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