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Brake repair experts also recommend annual brake inspection (and repair, if needed), or twice a year inspections if you use your vehicle for heavy hauling and towing work. Any deviation from quick and quiet brake functionality should be checked as soon as possible. Brake fluid inspection for possible moisture or metal flake contamination is an essential component of proper brake service and repair. Calipers and wheel cylinders can be adversely affected by contaminated fluid. Metal on metal parts should be kept adequately lubricated to maintain an effective barrier between them.