What is the purpose of the M915 primary air tank pull lanyard?

Answer: B — Manual evacuation of water in the system

The primary air tank pull lanyard on the M915 is primarily designed for manual evacuation of water from the system. This is important because moisture can accumulate in the air tanks due to condensation, which can lead to issues with air system performance and potentially affect the braking system. By using the pull lanyard, operators can effectively release any collected water, helping to maintain optimum performance and safety. Managing water accumulation in the air system is critical, especially in environments with fluctuating temperatures. This manual evacuation process ensures that the system remains clear of obstructions that could hamper operation and compromise safety during operation.