Ontario MTO Truck Knowledge Practice Test

The correct action when the air-pressure device becomes activated is to stop immediately in the safest place. This is crucial because the activation of the air-pressure device typically indicates a potential failure or significant drop in air pressure within the braking system. This can lead to a loss of braking power, making it dangerously unpredictable to continue driving. Stopping in a safe area allows you to assess the situation and take necessary precautions, such as contacting roadside assistance or performing any required repairs, to ensure the safety of yourself and others on the road. Continuing to drive cautiously, ignoring the device, or speeding up could all lead to critical safety risks, as they do not address the underlying issue that prompted the activation of the air-pressure device. It's essential to prioritize safety and address any alerts regarding braking systems without delay.