At what pressure should the service brake be pumped down during the low air pressure alarm test?

During the low air pressure alarm test, the service brake should be pumped down to a pressure range of 40-60 psi. This range is critical because it allows the operator to check the functionality of the low air pressure warning system.

When the pressure drops to between 40 and 60 psi, the warning alarm or indicator should activate. This ensures that the driver is aware of the low pressure condition, which is a safety concern. If the air pressure were to drop below this level, it could lead to brake failure, compromising the vehicle's ability to stop effectively.

Testing within this designated pressure range provides an important balance; it is low enough to trigger the warning system while still being within a safe operating procedure. Therefore, it’s paramount to conduct this test properly to ensure the vehicle's braking system is functioning as intended and to provide a safe driving experience.