Brake shoes are the friction component of drum braking systems, found on most vehicle axles. These curved metal shoes house riveted or bonded brake linings composed of durable friction materials. When hydraulic pressure activates the wheel cylinder, shoes press against the inner surface of the brake drum, creating stopping force via friction. Shoe construction incorporates spring mechanisms for automatic adjustment and return, alongside features like slots or holes for heat dissipation and debris shedding. Variations include narrow, standard, and wide shoe widths, alongside differing lining material compositions for varied performance characteristics.