Occasional brake noise is normal. If a metal-to-metal, continuous grinding or continuous squeal sound is present, the brake linings could be worn-out. Have the system checked by an authorized dealer.
Note:
Brake dust could accumulate on the wheels, even under normal driving conditions.Some dust is inevitable as the brakes wear, and does not contribute to brake noise. See
Cleaning Wheels.
Note:
Depending on applicable laws and regulations in the country for which your vehicle was originally built, your brake lamps could flash during heavy braking. Following this, your hazard lights could also flash when your vehicle comes to a stop.