When will the low air pressure warning system activate in a bus?

The low air pressure warning system is an essential safety feature in buses that helps drivers maintain safe operating conditions. The system is designed to alert the driver when the air pressure in the brake system drops to a level that could compromise braking effectiveness. In most bus systems, this warning typically activates when the pressure falls below 60 psi.

This threshold is critical because below 60 psi, the brake system may not function effectively enough to ensure safety while driving. Ensuring proper air pressure is vital for the operation of air brakes, which are standard in many buses, providing necessary stopping power under varying conditions. Knowing this pressure threshold allows drivers to take immediate action, such as checking for leaks or other issues, to maintain vehicle safety before it becomes a critical problem.