Piston actuated disc brake with means for pushing the piston

A disc brake comprising brake applying means associated with a carrying member so as to urge two friction pads towards the respective faces of a rotary disc, the brake applying means comprising at least one piston mounted in a cylinder and movable towards the disc from an idle position to urge one of the pads towards the corresponding face of the disc when the brake is operated, the carrying member comprising an aperture defining two circumferentially spaced edges, each of which comprises at least one sliding surface with which the one pad cooperates in accordance with the wear on its lining, at least one of the edges also comprising a slot offset towards the piston relative to the corresponding sliding surface, means being provided to push the piston back away from the disc towards said idle position, so that the pad can be brought opposite the slot, whose dimensions permit radial extraction of the pad through the aperture, wherein automatic adjusting means are associated with the piston, the means for pushing back the piston in opposition to the adjusting means being operated by introduction of a tool between the one pad and the piston after removal of a wedge forming element normally inserted therebetween.