During a light check, what does the presence of a yellow ABS light indicate?

The presence of a yellow ABS light during a light check indicates that the trailer is equipped with anti-lock brakes. The ABS system helps prevent wheel lock-up during sudden braking situations, allowing the driver to maintain steering control and stability. When the ABS light is illuminated, it signifies that the anti-lock braking system is operational and ready to perform its functions.

Other options might relate to potential issues with the braking system or trailer connection, but they do not accurately describe the specific role of the yellow ABS light. Understanding the function of the ABS light is crucial for ensuring safe vehicle operation and acknowledging the importance of readiness for braking performance.