Michigan CDL - Air Brakes Practice Exam

The malfunction lamps for vehicles equipped with Anti-Lock Braking Systems (ABS) are yellow. This color is specifically used to indicate potential issues or malfunctions related to the ABS. When the ABS light illuminates, it usually suggests that the anti-lock system is not functioning properly, which may affect the braking performance of the vehicle.

In contrast, red lamps often indicate immediate safety concerns, such as problems with the vehicle's primary braking system. Green lamps typically signify that a system is operational or functioning correctly, while blue lamps are generally used for auxiliary functions and aren’t associated with malfunctions in braking systems. Therefore, yellow serves as a clear warning sign for drivers to address any issues with their ABS promptly. This helps maintain safety and ensures the proper functioning of the vehicle's braking systems.