What is the air pressure threshold that triggers a low air pressure warning signal in a school bus with air brakes?

In a school bus equipped with air brakes, the air pressure threshold that activates the low air pressure warning signal is 60 psi. This safety feature is crucial as it alerts the driver to potentially dangerous conditions that may arise from insufficient air pressure in the braking system. If the air pressure drops to this level or lower, it could compromise the effectiveness of the brakes, leading to a higher risk of accidents.

Maintaining proper air pressure is vital for the braking system's functionality. The warning system is designed to keep the driver informed and prompt them to take corrective action, such as safely stopping the vehicle and addressing the issue before resuming operation. Understanding the significance of this threshold helps ensure the safe transport of passengers, particularly for school buses, which carry children and require a greater emphasis on safety.