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Any time you have an strange problem with lights it is a poor ground. Your tail lights are back feeding through the brake lights instead of going to ground. I would start by running a jumper wire to the tail light and brake light ground and I would guess the problem would be fixed. You might also want to look at your break light failure indicator. It commonly goes bad in these models.

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Q: Why on a 1987 Toyota Camry when the headlights are on the brake lights are always on but go off when you press on the brakes?
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