If you hear squeaks, squeals, grinding or other noises, there could be a problem. The exception to this rule is if your car has been exposed to moisture recently. Moisture can cause a thin layer of rust to develop, and slight squeaking immediately after rain is not unusual. If the squeaking continues, have your brakes inspected. Periodically check wear on your brake pads through the spaces between your wheels' spokes. The outside pad will be pressed against a metal rotor, and there should be at least ¼ inch of pad
. Any less, and you'll want to have the pads inspected or replaced.