Could be a fuse or could be a bad bulb. See sources and related links below for bulb part numbers.
turn signal switch needs replaced!
Probably the flasher unit needs to be replaced. This is an electronic switch which usually mounts underneath the dashboard.
Assuming the signal lights still work, no. But a bad brake light switch or a blown brake light fuse could.
either dimmer switch or blown fuse If you are saying that the tail brake lights are working but the third brake light is not....It may be a defective turn signal switch in the steering column.
There is what is called a brake sensor. This sensor has to engage to sent a signal to the transmission to release the pawl so that you can shift it. Replace the brake pedal sensor. It is usually on the top of the pedal arm upward under the dash. This will also cause the brake lights not to work. Good luck.
The brake lights and tail lights are separate wiring systems. Even some of the bulbs may have two separate bulbs in the same glass housing. If the bulbs are in fact working, then the next step would be to test the brake switch under the dash. When you depress the brake pedal the switch is pushed creating a connection to turn on the brake lights.
It needs checked out but both the hazard and brake lights go through the turn signal switch.
If the turn signal is working it's either the brake light switch or the turn signal switch.
I would check the running lights for one with a short. I had the same sort of thing with my trailer and I spent way to much time troubleshooting the brake and signal wires. Turns out a running light bulb connector was grounding out on the trailer and messing it all up.
Bad bulbs? Sockets corroded?
If the fuses and bulbs are okay I would blame the signal switch assembly. They call it a multi-function switch these days.
blubs blown? Check the turn signal switch.