The front brakes on your car have what is refered to as a "squealer". This squealer contacts the brake rotor and makes noise when your brakes get to a certain thickness to alert the driver that the brakes need to be checked. I would either check the brakes yourself by jacking it up and removing the wheels to see if they are worn out or take it to a garage and have them check them. If you drive for a while with the squealer contacting the rotor the brakes will get lower to the point that the rotors will need replaced if the problem is not fixed. If you have any other questions feel free to ask.
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