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How have you determined the bulbs are good? The brake bulbs are dual filament.....one for running lights, one for brake lights.
Just because the running lights operate does not mean the bulbs are OK.....so, a couple of bulbs should be the first step.

As you discovered, the third brake lamp is a direct feed from the pedal switch, but, going further, that same signal is sent to the BCM and the brake light circuit is actuated by it.

If you replace the bulbs with no success then the BCM (and related circuits) will require some diagnostic time.

Rob
 
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