When does the low air pressure warning buzzer sound on the M915?

Answer: C — Below 65 PSI

The low air pressure warning buzzer on the M915 is designed to alert the driver when the air pressure in the braking system falls to a level that could compromise safety. The correct threshold for this warning to activate is set at below 65 PSI. This is a critical safety feature, as maintaining proper air pressure is essential for effective braking performance. If the air pressure falls below this level, it indicates that the system may not be able to provide adequate braking force, which increases the risk of brake failure and potential accidents. Therefore, understanding this specification is crucial for operators of the M915 to ensure they can respond appropriately when the warning is activated, helping to maintain vehicle safety and operational integrity.