Knorr-Bremse develops, manufactures and markets S-Cam drum brakes and slack adjusters. Together with pneumatic brake actuators and brake drums they represent a foundation brake system. Knorr-Bremse Drum BrakeFunction of the productWith all types of drum brakes, friction forces are generated by internal brake shoes being pressed against the inner surfaces of the brake drum by the force generated by a cam. Due to their almost completely sealed housing, the brake shoes are well protected against corrosive influences (water, salt, dust) and dirt (sand, stones and mud), even when driving on rough