Well it depends if the sound stop completely when you brake... or does the sound go on until the vehicle comes to a complete stop....

It might be a wheel bearing that caused the brake disc to heat up... it might be the brakes...but by your description I wont say it's the brakes... unless the vehicle pulls to one side or is hard to drive...like something is draggin it back... that'll be the brakes. (Hard to explain over a message I know..)

If it's the wheelbearing you can jack up the car on that side and spin the wheel... it should spin freely for a couple of seconds and it should feel smooth when spinning it... if the wheel has a rumble when you spin the wheel it is most likely the wheelbearings. You'll feel it pinching up on stuff when holding your hand on the wheel and turning it