What should you do if the low air pressure warning comes on for one system in a dual air brake system?

Answer: C — Bring your vehicle to a complete stop and park it

When the low air pressure warning activates in a dual air brake system, stopping the vehicle immediately and parking it is the safest and most prudent course of action. The dual air brake system is designed to utilize two separate air systems, allowing for redundancy. This means that if one system has low pressure, it can lead to a significant reduction in braking capability. Continuing to drive under these circumstances increases the risk of a complete brake failure, potentially leading to loss of control over the vehicle, accidents, or severe injuries. Parking the vehicle ensures that you can address the issue without the dangers posed by operating a vehicle with compromised braking capacity. Once safely parked, you can inspect the air brake system for leaks or faults, and seek repairs as necessary, thereby ensuring the vehicle is safe to operate before returning to the road.