Brake drums are circular metal components that serve as a friction element in drum brake systems. When the driver presses the brake pedal, brake shoes are extended against the inner surface of the drum, creating friction that slows down the vehicle. Heavy-duty brake drums are specifically engineered for larger vehicles such as trucks, buses, and trailers, where higher loads and brake stress are common. Made from durable materials, these drums are designed to resist warping, cracking, and wear, ensuring longevity and consistent performance.