Check Coolant
You're right, coming on during hard braking is not normal. With two years of ownership I have found the oil and coolant levels to be very, very finicky. A teaspoon too much of antifreeze will mean it's too high when up to operating temperature. A teaspoon too little and the warning light will come on when it's cool. The same with the oil level indicator. It's a matter of very, very small changes until you get it just right.
p.s. We have a foot of snow in this part of Ohio this morning. Wish I were back with the family in Austin.
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