1. Check the brake light bulb. If the brake light bulb is burned out, it will need to be replaced.
2. Check the brake light switch. The brake light switch is located under the brake pedal. If it is not working properly, it will need to be replaced.
3. Check the wiring. The wiring to the tail lights may be damaged or disconnected. If this is the case, the wiring will need to be repaired.
These are just a few of the possible causes of a tail light not working. If you are not comfortable checking these things yourself, you can take your car to a mechanic for diagnosis and repair.
In some cases, a tail light that does not come on when the brake pedal is pressed can be an easy fix. For example, if the problem is simply a blown fuse, replacing the fuse will fix the problem. However, if the problem is with the wiring, it may be more difficult to fix and may require the help of a mechanic.