Drum brake cables are essential parts of the drum brake system, primarily found in older vehicles and some modern designs. These cables connect the brake levers to the brake shoes, responsible for applying pressure to the drum when the brakes are activated. The mechanism consists of several key components, including the cable, lever, and linking brackets. When the driver presses the brake pedal, it activates the hydraulic system, which then pulls the cable, causing the brake shoes to expand and press against the inner surface of the drum, resulting in deceleration.