Abstract: An S-cam brake including a brake chamber to which compressed air is supplied; a slack adjuster rotatably connecting to the brake chamber; an S-cam unit having an S-cam connecting to and rotating around the slack adjuster; and a drum having a lining generating braking force with widening according to rotation of the S-cam is provided, wherein the brake chamber includes an upper housing having an air supply port through which compressed air is introduced; a lower housing coupled to the upper housing to form an internal space; a diaphragm having edges fixed to the upper housing and the lower housing and deformed by compressed air; a piston disposed to contact the diaphragm and move linearly; a piston push rod extending from the piston and having one end connected to the slack adjuster; and a spring having one end supported by the piston and the other end supported by the lower housing, wherein a thickness of the upper housing is greater than a thickness of the lower housing.

Abstract: An S-cam brake including a brake chamber to which compressed air is supplied; a slack adjuster rotatably connecting to the brake chamber; an S-cam unit having an S-cam connecting to and rotating around the slack adjuster; and a drum having a lining generating braking force with widening according to rotation of the S-cam is provided, wherein the brake chamber includes an upper housing having an air supply port through which compressed air is introduced; a lower housing coupled to the upper housing to form an internal space; a diaphragm having edges fixed to the upper housing and the lower housing and deformed by compressed air; a piston disposed to contact the diaphragm and move linearly; a piston push rod extending from the piston and having one end connected to the slack adjuster; and a spring having one end supported by the piston and the other end supported by the lower housing, wherein a thickness of the upper housing is greater than a thickness of the lower housing.