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Some brake pads have a 'squealer' plate attached. This thin plate does not do anything until the pads become badly worn. Then the plate rubs against the rotor, squealing to let you know you need to replace the pads - before they damage the rotors. Without this feature, pads wear out then grind deep grooves in the rotors that then have to be resurfaced (ground smooth again if there is enough metal left) or replaced. The main advantage to this type of pad is to warn the consumer prior to wearing the pads below safe levels and have to replace a set of expensive brake rotors.

Ask your mechanic if you have a brake squealer and listen for the sound to make sure you replace your brakes before you need to replace your rotors as well.