Change out the switch. Bad switch!!
check the fuse for the brake lights, they have thier own. also check the brake light switch at the at the top of the brake petal
The running lights have a bad ground.
Hardness in the brake pedal can because by low brake fluid. Air in the brake lines can also cause the pedal to push hard.
check brake light fuse and brake light switch on pedal
burnt out lightbulb!
Check the wire which is going inside of the trunk hood to the brake lights.
Blown bulbs, blown fuse, broken or out of adjustment brake light switch.
check the brake light switch on the brake pedal
burnt fuse ... tail lights are on a different circuit than stop or turn lights
Check the fuses.
check that you have double filament bulbs in tail lights
Brake Lights that Will Not Turn OffAlthough it's possible there could be other reasons, the most common causes for brake lights to stay on continuously include:The brake light [if mounting position is adjustable] is out of adjustment, orThe brake light switch contacts are fused ["welded"/melted] together, orThe brake light switch is otherwise defective.
If you have no brake lights or tail lights then you've probably got an electrical problem. Check the fuses first and see if you have one or more blown.
Your fuse could be blown, or the brake light switch is improperly adjusted.
check wire continuity- no power no lights
Check the switch at the brake pedal .
fault brake light switch, located at the top of the brake pedal.
You probably have a loose wire connection in the brake light sockets. Insert a nail or probe tip into the back of the light socket where the wires are inserted and test the brake lights. (The socket can appear perfectly normal and the wires may even seem well attached.)
check fuses, and then check for power to the bulbs check for power in and out of brake switch
I'm not a mechanic but I would start by checking the brake fluid level in the brake master cylinder in your engine compartment
It has a flasher relay for the signals only.
does 1990 geo tracker have air bags
FRONT OR REAR ?
The brake light switch is stuck or out of adjustment. If it is a mechanical switch it is located somewhere on the brake pedal swing arm. If it is a pressure switch it is located near the Master Cylinder.