Check the fuses first then check the bulbs.
Could be the brake light switch or fuse.
It is not necessarily the fuse. It could be the switch on the brake that is not closing the circuit.
if the tail lights work but not brake lights then its most likely just a blown fuse or it could be the switch at the top of your brake pedal arm.
Could be a bad wiring harness, disruption of the circuit somewhere between the brake pedal and the brake lights, a bad switch which fails to actuate the brake lights. See sources and related links below for bulb information.
it could be that your brake light switch under your dash that sits right on top of your brake pedal has gone out
You may have blown a fuse. You may have to replace your brake light switch which is located above the brake pedal under the dash. Also it could be your emergency flasher knob if its broken. All of your turn signals and break lights run through it and if the connections on it are off none of the brake lights and turn signals will work.
It could be the brake light switch (the switch that activates the brake lights when you step on the brake pedal) has gone bad
possibly the fuse for brake lights......also could be brake light switch----turn signal switch----broken wiring anywhere in the vehicle---relay not working ---any other item specific to your venicle.
A defective brake light switch could cause the problem. Also a defective turn signal switch could also. The brake lights work through the turn signals. It cancels the brake light so that the turn signal can work.
check your ground wire in the back
To be more specific, the ground wire must work and the bulbs, fuses, etc.. Or the back up lights and turn signals and brake lights wouldn't work? Right? Could it be the back panel...and still let the brake/turn/backup lights work? I need help fast. Thanks!
On the 1979 B200 Sportsman V8 if the brake pedal makes all signal lights come on and hazards and flashers do not work on their own, it could be the flasher, but the culprit could also be a burned out bulb or a short in the wiring.