Which indicator suggests that a service brake should be rejected during inspection?

The presence of the red brake warning lamp during the test is a crucial indicator of brake system issues that may compromise safety. When this warning lamp is illuminated, it signals that there is a potential problem with the braking system, which can include low brake fluid levels, a malfunctioning brake system, or issues with the anti-lock braking system (ABS).

During a commercial inspection, it is vital to ensure that the braking system is functioning correctly to maintain safety standards and compliance with regulations. Therefore, if the red brake warning lamp is on, it indicates a need for further inspection and potential rejection of the service brakes until the issue is resolved.

In contrast, if the warning lamp is not illuminated, the brakes are providing adequate stopping distance, and the brake fluid levels are satisfactory, these conditions generally indicate that the braking system is functioning properly. The illumination of the red brake warning lamp stands out as a primary concern, prompting immediate attention to ensure the safety and operability of the vehicle.