Abstract: A motor vehicle drum brake (10) includes: two braking segments (18A, 18B); an anchoring element (28) including two bearing surfaces (32A, 32B) of two second ends (24) of the braking segments (18A, 18B); a wheel cylinder (34) which, in a first “simplex” operating mode, is suitable for transversally separating the adjacent first ends (22) of the segments (18A, 18B); the anchoring element (28) including: a fixed body (42) wherein two sliding pistons (50A, 50B) each carry a bearing surface (32A, 32B); and elements (44) for separating the pistons (50A, 50B) between an anchoring position wherein they abut against the body (42), and a sliding position wherein the pistons (32A, 32B) are separated to allow the sliding thereof during operation in so-called “servo-dual” mode.

Abstract: A motor vehicle drum brake (10) includes: two braking segments (18A, 18B); an anchoring element (28) including two bearing surfaces (32A, 32B) of two second ends (24) of the braking segments (18A, 18B); a wheel cylinder (34) which, in a first “simplex” operating mode, is suitable for transversally separating the adjacent first ends (22) of the segments (18A, 18B); the anchoring element (28) including: a fixed body (42) wherein two sliding pistons (50A, 50B) each carry a bearing surface (32A, 32B); and elements (44) for separating the pistons (50A, 50B) between an anchoring position wherein they abut against the body (42), and a sliding position wherein the pistons (32A, 32B) are separated to allow the sliding thereof during operation in so-called “servo-dual” mode.

Abstract: A drum (2) for a brake having a series of fins (12) that are secured via a first end (16) to an external wall (11) of the drum. The fins alternate on the external wall of the drum. It is possible to provide an outer annulus (10) surrounding the drum, a second end (17) of the fins being secured to said outer annulus. Another subject of the invention is a drum brake (1) comprising such a drum.