DISC BRAKE CALIPER

摘要

A generic disc brake caliper (1) comprises a hydraulic operating device (7) consisting of a brake cylinder (8) and a brake piston (9) that is movably fitted therein. The brake piston (9) is sealed in relation to the brake cylinder (8) by means of a seal ring (10) that is placed in a circumferential ring groove (11) of the brake cylinder (8). In addition to causing a sealing effect, said seal ring (10) has the task of drawing back the brake piston (9) in the brake cylinder (8) after the brakes have been applied in order to produce a release play between a brake pad (3, 4) and a disc brake (2). According to the invention, the ring groove (11) comprises a recess (16) which is placed in the transit zone between a groove wall (14) and the surface of the cylinder (12). The contour line (17) defining the cross-section of the recess goes from the groove wall (14) of the ring groove (11) starting at a convex curved section (18) and runs past a concave curved section (19). This ensures a uniform and constant release play between brake pad (3, 4) and brake disc (2) almost independently from hydraulic pressure.