What safety measure should be taken if the air supply to the trailer is lost?

If the air supply to the trailer is lost, the appropriate safety measure is to stop immediately and inspect the situation. This is crucial because loss of air pressure can lead to the trailer brakes automatically engaging. As a result, the vehicle may become difficult to control or come to a sudden stop, which poses a significant risk on the road. Stopping immediately allows the driver to assess the problem, ensure that the brakes are functioning correctly, and prevent potential accidents.

Continuing to drive cautiously could compromise safety, as the trailer might not respond as expected or could unexpectedly brake, leading to loss of vehicle control. Resetting the trailer brakes isn't advisable without first determining the cause of the air loss since doing so may not address the underlying issue and might create a hazardous driving condition. Notifying maintenance is important, but it should come after ensuring the vehicle is stopped and safe to inspect. Thus, stopping immediately to inspect allows the driver to take the right steps to ensure safety and mitigate risks.