Is it all the brake lights on the back? If so, likely the plastic plug on the brake pedal arm that opens the brake switch when the pedal is released. Many manufacturers use this setup. My Accord had this problem- noticed pieces of plastic in the floor. Used a plastic clip like for the fender liner, through the hole in the brake pedal arm. Some people glue a penny over the hole. When pedal is pushed, the plunger comes out of the switch and turns brake lights on. Without the little plug to push the plunger in when pedal is released, the plunger is always out, and brake lights are always on. Get a flashlight and look at your pedal under dash.
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Is it all the brake lights on the back? If so, likely the plastic plug on the brake pedal arm that opens the brake switch when the pedal is released. Many manufacturers use this setup. My Accord had this problem- noticed pieces of plastic in the floor. Used a plastic clip like for the fender liner, through the hole in the brake pedal arm. Some people glue a penny over the hole. When pedal is pushed, the plunger comes out of the switch and turns brake lights on. Without the little plug to push the plunger in when pedal is released, the plunger is always out, and brake lights are always on. Get a flashlight and look at your pedal under dash.