Your brake lights should be on all the time as running lights. Are you sure you aren't seeing the runners and not the actual brighter brake light.
If it is a switch stuck I would say it would have to be the rear one behind the left foot peg.
Do a quick test and turn the bike on and press the peddle or pull in the brake lever and see if it lights up more.
If it is a switch stuck I would say it would have to be the rear one behind the left foot peg.
Do a quick test and turn the bike on and press the peddle or pull in the brake lever and see if it lights up more.