Brake mechanical components facilitate vehicle deceleration and stopping through friction. This category encompasses drums, rotors, calipers, wheel cylinders, and related hardware directly converting kinetic energy into thermal energy. Components are utilized within the wheel assemblies and hydraulic brake systems of all vehicle types. Key features include high-carbon steel or cast iron construction for durability, precise dimensional tolerances for consistent performance, and engineered surface treatments to manage heat and corrosion. Friction material interfaces, such as pads and shoes, are considered separate components despite integral function. Regular inspection and replacement are critical for maintaining stopping power and driver safety.