Brake shoes are essential components of a vehicle's braking system, primarily found in drum brakes. They are curved pieces of metal that press against the inner surface of the brake drum when the brakes are applied, creating friction to slow down or stop the vehicle. Made from materials like friction linings, brake shoes wear down over time and need to be replaced to ensure safe braking performance. Regular inspection and maintenance of brake shoes are crucial for vehicle safety, as worn-out shoes can lead to decreased braking efficiency and potential accidents.