If both brake lights are not working this suggests (a) that both bulbs have blown - this is a real possibility, (b) a faulty brake switch (this is normally situated under the dashboard on or near the brake pedal) - also the brake switch may be sticking, (c) a loose or disconnected connector, (d) severed cabling, or (e) a blown fuse. Check the fuse first, then the connectors, then that there is a supply voltage at the brake pedal switch and that the switch works properly.
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