Hello I have a 2002 Honda Accord V-6 automatic which has 20k miles on it. Lately when I put the car in reverse, I hear this high pitch metalic noise coming from the front wheels. Also when the car comes to an abrupt stop, some type of a noise, again from the front wheels, is heard. Before I take this car to the mechanic, I need to ask, isn't a bit early for the brakes pads to be worn out? Or is it just about time? Also, since the car is still under warranty, is it advisable to use the dealership for this type of work? Thanks in advance.