Carlisle Brake & Friction's MB21 brake lining, represents the on-highway industry’s highest quality premium grade friction material. MB21 is a technologically advanced friction formulation designed to address fleet demands for brake linings that provide a longer service life with excellent drum compatibility. MB21 was designed to fulfill a wide range of over-the road service applications and will improve your bottom line by providing long-lasting performance and reducing the occurrence of brake maintenance expense requirements.