more then one light bulb in it open and replace the burn ones.
The most likely cause is a bad brake light switch (if none of the brake lights illuminate) but if its only one of the brake lights, try changing the bulb. Even if they still work as running or turn lights because they have a double filament and may still work partially, but not as brake lights.
I would guess that both of your brake light bulbs are burned out, and only the high mount bulbs are still working.
If all have failed possible fuse or brake light switch If only one has failed bulb or wiring to that fixture only
Brake lights only come on when you press the pedal. The brake light is either a different bulb or filament in a dual-filament bulb than the tail light.
The brake lights and the tail lights are separate circuits. Check the brake light fuse, then check the brake light bulbs, then check the brake light switch.
The brake light on most vehicles is not only an indicator that the parking brake is on, but that there is a problem with the system.
A bad switch, or a short in the wiring. This behavior in only one brake light would indicate the latter. Good luck
There are a few reasons that the third brake light is the only one working. One reason could be that there is a short in the wires of your main brake light. Another reason is that the light bulb has blown out.
replace taillight bulbs first. filiment from brake light can break and make a connection to your park light. pressing brake pedal can light up your turn indicators, or even park/dash lights
When a light source is only partially blocked and there is only a partial shadow on an object.
The brake light, a red light shaped like a headlight on the dash means that one or more exterior lights are not working. It could be a taillight, brake light, side marker, license plate light, or third brake light. It stays on all the time if it's a side marker or any light besides the brake light. If it's the brake or third brake light it will come on only when you press the brake pedal.
Check the bulb- it is probably double filamented with smaller for brake light and larger for tailight