What materials are commonly used for brake linings?

Answer: B — Asbestos-free composites, ceramic, and metallic materials

The use of asbestos-free composites, ceramic, and metallic materials for brake linings is prevalent due to their high performance under a variety of conditions. Asbestos was once widely used in brake linings for its heat resistance, but due to health concerns associated with asbestos exposure, the industry has shifted towards safer alternatives. Asbestos-free composites typically combine organic fibers with a binding material to provide excellent friction characteristics and durability. Ceramic materials offer low dust production, reduced noise, and stable performance over a wide temperature range. Metallic materials, while sometimes resulting in more noise and dust, provide high strength and durability, making them suitable for applications that require robust braking power, such as those found in school buses. Thus, the combination of these materials ensures that the brake linings meet safety and performance standards effectively, reflecting the advanced engineering applied in current brake system designs.