What could cause a vehicle's red brake warning light to stay ON?

The red brake warning light on a vehicle serves as an important indicator that alerts the driver to potential issues with the braking system. When this warning light remains illuminated, it can signify several underlying problems.

One of the main reasons for the light to stay on is related to the parking brake system. If the parking brake is engaged, whether fully or partially, it will trigger the warning light. Additionally, if there are issues within the parking brake system itself—such as a malfunctioning switch or a problem with the brake lever—it can also keep the red warning light on.

Another crucial factor is the level of brake fluid in the master cylinder. If the brake fluid gets too low, which can happen due to leaks in the braking system or brake pad wear, the warning light will also activate. Low brake fluid signifies that the hydraulic pressure needed for the braking system to function properly may be compromised, thereby presenting a safety risk.

Since both issues can independently cause the red brake warning light to remain on, it is accurate to say that the combination of parking brake system issues and low brake fluid levels (both identified in the second and third choices) are responsible for this warning light being activated. Hence, selecting the option that encompasses both scenarios provides a comprehensive understanding of why