What action should be taken if the air compressor's safety valve releases air?

When the air compressor's safety valve releases air, it indicates that the system is either over-pressurized or there is a fault in the air brake system. This is a critical safety feature designed to prevent excessive pressure buildup, but the activation of the safety valve signifies that there is an underlying issue that needs to be addressed.

Having the system checked by a mechanic is essential to ensure that potential problems are identified and repaired promptly. A mechanic can perform a thorough inspection of the air compressor, the safety valve, and the overall air brake system to determine the cause of the safety valve's activation. Addressing this issue quickly is vital for maintaining safe operation of the vehicle, as faults in the air braking system can lead to brake failure, posing a serious risk on the road.

Choosing to ignore the situation, as suggested in some other options, or simply checking the air pressure without addressing the root cause does not resolve the issue, and resetting the compressor without professional evaluation can lead to further complications or dangers. Hence, consulting a professional is the most prudent action to ensure safety and functionality of the air braking system.