The brake light of your vehicle is not working. What could be the cause of this?

In your response, you identified two possible causes for the brake light not functioning: a defective fuse and a defective bulb. Both are indeed valid reasons for a brake light malfunction.

Under German traffic regulations, it's imperative for vehicles to have functioning brake lights to ensure safety on the roads. If a brake light is not working, it can lead to accidents since other drivers may not realize when you're slowing down or stopping. Regular checks of the electrical systems, including fuses and bulbs, are essential for maintaining vehicle safety.

It's important to note, however, that faulty brake fluid levels, while not directly related to the issue of the brake light itself, can lead to other braking system problems. In a comprehensive inspection, the brake fluid level should also be checked to ensure the entire braking system functions properly.

Each of these checks contributes to the overall safety and performance of your vehicle, aligning with the responsibilities outlined in the Straßenverkehrsordnung (StVO) in Germany.