To ensure safety, it is crucial that a cautionary alert is triggered before the air pressure in the tank drops below _________.

It's important that a warning signal comes on before the air pressure in the tank falls below 60 psi. This threshold is a critical point in the air brake system, and it triggers a low air pressure warning signal to alert the driver that the air pressure is reaching a dangerously low level. The warning signal is designed to provide timely notification to the driver, indicating that immediate action is required to prevent brake failure or loss of braking power. Therefore, maintaining the air pressure above 60 psi is crucial for the safe operation of the vehicle equipped with air brakes.