When the low air pressure warning is activated, the recommended action is to:

When the low air pressure warning is activated, the recommended action is to:

• A. Continue driving to the nearest service area
• B. Check mirrors
• C. Stop immediately
• D. Pump the brakes

Answer: (C)

When the low air pressure warning comes on, the braking system is not maintaining enough air to function safely. Brakes in an air-operated system depend on stored pressure, so as it drops, braking power decreases and the risk of brake failure increases. The safest action is to stop immediately in a safe place to prevent loss of braking capability, then inspect the system for leaks or other problems with the compressor, lines, or tanks. Pumping the brakes won’t restore pressure in an air failure, and continuing to drive or simply checking mirrors does not address the immediate safety hazard.

When the low air pressure warning comes on, the braking system is not maintaining enough air to function safely. Brakes in an air-operated system depend on stored pressure, so as it drops, braking power decreases and the risk of brake failure increases. The safest action is to stop immediately in a safe place to prevent loss of braking capability, then inspect the system for leaks or other problems with the compressor, lines, or tanks. Pumping the brakes won’t restore pressure in an air failure, and continuing to drive or simply checking mirrors does not address the immediate safety hazard.