Abstract: The invention relates to a differential-brake group for vehicle driving axles. On two supports (31) of a frame (3) the box (5) of a transmission (4) is rotatably mounted, with rotation freedom, the transmission (4) being predisposed for the transmission of drive to two half-shafts (2). Two braking devices (6) are associated to the walls (31), one for each half-shaft (2), which braking devices (6) form a single block with a sort of cover (32) peripherally equipped with a flange (33). In a seating made in the cover (32) the end part (8) of the drive input shaft into the differential is supported by use of bearings. The whole group is conformed in order to be insertable through an aperture (7) in an axle (1) and in order to be fixable to the axle (1) by use of a flange (3) .