Carlisle Brake & Friction's CF2000 brake block friction offers performance characteristics proven to extend and maintain brake life and performance. Carlisle Cohesive Friction brake linings are free from abrasive particles that “dig” into the drum as many of today's heavy duty brake linings do. Cohesive Friction creates a transfer layer of non-abrasive particles which smear onto the face of the drum. This approach to heavy duty braking results in a friction material that will Increase the life of your brake linings.