Which pressure reading indicates an imminent need for action based on the low air warning light?

The pressure reading that indicates an imminent need for action based on the low air warning light is generally around 55 to 75 psi. This range signifies that the air pressure in the system is approaching a critically low level, which can lead to brake failure if not addressed promptly. In vehicle air brake systems, the low air warning light is designed to alert the operator when the air pressure falls below a safe operational threshold, typically around 60 psi.

When the pressure drops into this range, immediate corrective actions such as pulling over to check for leaks, ensuring the air compressor is functioning correctly, or taking necessary steps to replenish air pressure must be taken. Operating below this pressure range can compromise the safety of the vehicle and its ability to stop effectively. Thus, monitoring this pressure reading is crucial for ensuring safe operation and preventing potential hazards on the road.