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When that happens, it means that the brake wear indicators may be scraping against the rotors. The grinding and growling sound of metal on metal means only one thing: that your brake pads are completely worn away. It is advisable to have a certified brake repair technician inspect your brakes on an annual basis, twice a year if you regularly do heavy hauling and towing work. Your brake repair technician should check all metal to metal contact points for proper lubrication, which maintains an effective barrier between the different contact points, and inspect brake fluid for metal flake or moisture contamination. Contaminated fluid damages essential braking components.