when battery and brake light comes on while driving what does that mean on 2001 Mitsubishi Montero Sport

i have a 2001 mitsubishi montero sport

Asked by for the 2001 Mitsubishi Montero Sport
Mine was the alternator.Go to an Auto Zone, OReilly's or whatever is near and they will check it for free.
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I have a 2003 Misibishi sport battery and brake light comes on and off