What is the importance of the low air pressure warning signal in an air brake system?

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The low air pressure warning signal plays a crucial role in an air brake system by alerting the driver when the air pressure drops below a safe level. This is vital for the safe operation of the vehicle because air brake systems rely on adequate air pressure to function effectively. If the pressure falls too low, the brakes may not engage properly, increasing the risk of accidents. Thus, this warning signal serves as an essential safety feature, enabling the driver to take corrective action before any potential brake failure occurs.

The other choices do not relate directly to the function of the low air pressure warning signal: it doesn’t inform the driver about tire pressure, indicate when the brakes are applied, or signal gear changes, which are separate functionalities within the vehicle's systems.

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