At what psi must the low air warning devices on a dual air system activate?

The low air warning devices on a dual air system are designed to activate at 60 psi. This is an important safety feature in a school bus's air brake system, as it alerts the driver to a potentially unsafe situation. When the air pressure drops to this level, it indicates that the air brake system may not function effectively, which could compromise the ability to stop the vehicle safely.

The activation of the low air warning device at 60 psi serves as a critical reminder for drivers to take immediate action, such as pulling over safely to inspect the air pressure and possibly address any issues with the air brake system. Understanding this specific pressure threshold is vital for bus drivers to ensure the safety of their passengers and comply with regulatory standards regarding vehicle maintenance and operation.