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Sounds like your alternator is going bad. The extra juiced used when breaking robs power from the other lights. Pulsing when idling sounds like the voltage regulator which is built into the alternator. Have it replaced.

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17y ago
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Q: Why does your headlights console lights and dome light dim when you hit the brakes on a 1999 Monte Carlo and the lights seem to pulse when the car is idling?
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