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As in the previous comments the brake switch wire goes to the turn signal switch and the third brake light. Since the 3rd brake light is working, the problem is in the turn signal switch. When the switch is centered, both brake lights have 12v to them. When you make a left or right turn, the switch has to switch connections between the turn signal blinker and the brake light circuit for the appropriate illumination of the proper light sequence. Buy a new turn signal switch and temporary plug it in. You will see the proper operation.
Censor issue maybe. My brake lights did the same thing. I just readjusted the lining... around the trunk latch. And learned to pump my brakes after I turned the engine off. It finally worked itself out.
This sounds very much like a grounding problem on your lamp cluster, some times a cluster of lamps use a common ground ( negative wire). Also some cars use the car body as the ground connection. I think the reason the tail light works when the brake light is off is because the tail light is grounded through the brake light bulb. Check the bulb holder and the ground connection.
first of all do you have a third brake light and does it work???? you could have a bad brake light switch turn on the head lights check all rear lamps then put on the 4 way flashers and check the bulbs the ones that dont light should be the brake lights or replace the tail lights they should be double fillament
Is there a switch on the left side of the dash that has a red lens and a wavy line across it? If so, you have a rear fog light switch and it has been activated, causing your brake lights to come on each time you turn your headlights on. Flip the switch and the rear lights should display only the parking lights with the headlights on.