2013-2020 Mercedes-Benz SL-Class / AMG (R231) CCB Big Brake Kit | AP Racing 9560 6-Piston2013 2020 Mercedes Benz SL400 SL450 SL500 SL550 SL63 SL65 (R231) CCB Big Brake Kit Genuine AP Racing CP9560 Radi CAL II 6 Piston Caliper Front + Genuine AP Racing CP9541 Radi CAL II 4 Piston Caliper Rear Setup The R231 SL is heavy, fast, and often driven on large open spoke wheels where iron brake dust, heat checking, and repeated high speed stops become visible ownership costs. This StopFlex kit replaces the factory brake package with 380mm carbon