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The expansion of the brake shoes is facilitated by a cam mechanism, which converts the linear motion of the brake pedal into the radial movement of the shoes. The cam rotates and pushes the shoes outward, increasing contact with the drum surface. Friction between the shoes and the drum generates the necessary braking force to slow down or stop the vehicle.
mechanical drum brake diagram

Another notable disadvantage is their performance in wet conditions. When exposed to water, drum brakes can diminish in effectiveness until they dry out, leading to concerns around safety. Furthermore, since they are often housed within a drum, maintenance can be more challenging, potentially leading to neglected issues.
drum and disc brake system
