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Your tail lights are designed to come on with your low beams so that drivers behind you can see you better. It basically assumes that it is dark out. Im assuming you are referring to your tail lights, as tail lights and brake lights are two differing brightness bulbs in the same lens housing. Your tail lights will come on with your headlights, but your brake lights only come on when you depress the brake.

*Note: If you were referring to the actual brakelights, do not drive your car on public roads or your chances of being in a rear-end collision are very high. Take your car to a certified automotive technician and have them checked out.

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Q: Why do your brake lights come on when you put low beam on?
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