If your brake lights aren’t working after changing the bulbs, the problem could be due to various factors. The bulbs might be faulty, or you could have issues with the wiring in your brake system.
Also, if your turn signal and brake lights share the same circuit, a faulty turn signal might be the reason your brake lights aren’t working. It’s best to speak to a mechanic if you’re unsure why your brake lights aren’t functioning correctly, as this can also be the result of a faulty fuse.