brake light 2000 grand villager

2000 Voyager brake light comes on when turning left only. We've had the brake fluid filled...seemed to help for awhile, but is happening again. Could it be caused by anything else?
thanks,
Brian

Have the brake lines checked immediately. There are flexible lines leading to the brake calipers and it sounds like you have one going bad. When you turn left you are probably opening a crack in the line allowing the fluid to flow out freely. That is why the brake light is coming on, you are losing fluid and the pressure drop causes the light activation.