Ace Your CDL Class A Exam 2025 – Rev Up for Road-Ready Success!

To identify if your trailer is equipped with anti-lock brakes (ABS), the correct approach is to look for a green ABS indicator light. This light typically illuminates when the ABS system is active and functioning properly. The presence of this light means that the trailer has an ABS system installed.

The yellow ABS malfunction lamp indicates that there may be a problem with the ABS system. If this light is illuminated or flashing, it suggests that while the trailer has an ABS system, it is currently malfunctioning. This distinction is important because simply finding a malfunction lamp does not confirm the presence of operational ABS; instead, it indicates a fault in the system.

Considering the manufacturer’s sticker may provide information about the trailer's specifications, it does not serve as an immediate identifier of the ABS system's functionality. Similarly, examining the brake lines for visible damage can help assess the general condition of the brake system, but it does not confirm whether ABS is present. Thus, the green ABS indicator light is the most direct method to identify the presence of anti-lock brakes on a trailer.