It's a pisser talking with people with the same vehicle:
I've had my Tracker about 2 months, and the same thing. Started after about a week. Only on left-hand turns.
The reservoir looked "sufficiently" filled, and in the begnning, it only happened on semi-sharp left turns. Then MOST left turns. Then all of them.
I chalked it up to oh crap, gonna need brakes. But I can't really tell if the brakes are bad because I don't any reference point for this vehicle, and my mechanic didn't mention seeing anything bad there.
It has always stopped fine, no noise, but this pedal requires more pressure to "stay" stopped than my prior vehicles. She would roll if I didn't apply enough pressure.
Well, just yesterday, I filled the reservoir to overflow--and no more light. Also SEEMS to need less pressure to stay stopped.
We'll see how long this lasts.