Depending on the vehicle turn on the emergency flashers. Most older cars use the same bulbs for brakes and emergency light. If they are the same and blink, then check the power to the brake light switch. If there is no power there, check the fuses. Also make sure that the brake light bulbs are good.
What make ,model an year vehicle ? Some newer vehicles with BCM'S - body control modules turn on these brake lights . Brake light switch is really a position sensor , it inputs to the BCM .
Check the brake light switch at the brake pedal!
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