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The grinding or growling sounds that metal on metal makes is a clear signal that your brake pads have completely worn away. Brake repair specialists recommend that car owners have their brakes serviced as soon as it becomes apparent that something is amiss. You should still have your brakes inspected at least once a year even if nothing appears to be wrong. There are also certain maintenance tasks that should be performed on a regular basis to ensure that your brakes remain in optimal condition and to minimize the need for brake repair. Also have your brake fluid checked periodically for the presence of metal particles and moisture.