What type of brake lining is typically used on heavy-duty vehicles?

Heavy-duty vehicles, such as trucks and buses, typically use drum brakes with asbestos-free organic brake linings. These linings are composed of a mixture of organic fibers, such as cotton, fiberglass, or Kevlar, and a resin binder. The organic fibers provide strength and durability, while the resin binder helps to hold the fibers together and create a摩擦surface. Asbestos-free organic brake linings are designed to withstand the high heat and friction generated by heavy-duty vehicles, and they can also be used in wet or dry conditions.