What signal indicates no brakes during nighttime operations?

The correct signal indicating no brakes during nighttime operations is when all lights are flashing erratically. This signaling method enhances visibility and conveys an urgent message about the faulty brake system to any personnel nearby. It provides clear indications that there are safety concerns that need addressing, especially in a low-light environment, where visual communication is critical for maintaining safety on the flight line.

Erratic flashing draws immediate attention to the situation, differentiating it from other signals that might denote different statuses or routine operations. In contrast, other options like steadily flashing lights or a beacon light serve different purposes and may not effectively communicate the urgency associated with the no brakes condition. The red warning light is typically associated with warnings but does not convey the immediate level of danger that erratic flashing lights do during nighttime operations.