If the brake warning light illuminates while driving, what should you do?

When the brake warning light illuminates while driving, it is an indication that there is a potential issue with the vehicle's braking system, which is a critical safety component. Selecting to have the brake system inspected immediately is the most prudent action. This prompt response helps to address any underlying problems, ensuring the brakes are functioning correctly and preventing potentially dangerous situations such as brake failure.

This course of action prioritizes safety, as ignoring the warning (as suggested in one of the other choices) could lead to dire consequences. Likewise, merely checking the brake fluid level without a thorough inspection does not guarantee the vehicle's safety, as there may be other issues at play that require professional attention. Turning off the vehicle might not be appropriate in all driving situations, particularly if doing so could result in losing control of the vehicle. Therefore, seeking an immediate inspection of the brake system is the best way to ensure safety on the road.