Abstract: A disc brake having a caliper slidingly mounted on a fixed support and including two friction pads received with anchorage and sliding in the fixed support. The two friction pads frictionally engage opposite faces of a rotating disc in response to actuation of a brake motor carried by the caliper. The caliper slides with respect to the fixed support on at least one axial guide pin. The guide pin including a first part secured to the caliper or to the fixed support, and a second part received with and sliding in a corresponding bore of the fixed support or caliper, respectively. An elastic member is located between the axial guide pin and corresponding bore in which it slides. The second part of the guide pin consists of a tube made of an elastic material which has slits that extend through its thickness of the tube and over at least part of its length. The slits which are uniformly distributed along the periphery of the tube form equidistant thin strips having an equal width.

Abstract: A device for actuating a piston located in a cylinder of a disk brake. A push rod translationally secured to the piston is connected to a lever through a ball joint. The lever extend through an elongated opening in an end member secured to the cylinder. The end member has an inclined plane which forms a cam surface with respect to an axial plane of the cylinder. A roller member attached to the lever engages the inclined plane at a single point of engagement. An input force applied to the lever causes the roller member to move on the inclined plane and impart pure axial translational movement to the push rod to correspondingly move the piston within the cylinder and correspondingly effect an actuation of the disk brake.

Abstract: The invention relates to a wheel cylinder for a drum brake, comprising a body (2) provided with a longitudinal bore, two pistons (4,6) sliding in opposite directions outwards in the bore under the action of a pressurized fluid introduced between the pistons against the return springs of the shoes of the brake, and a mechanism limiting the return travel of the pistons when the pressure is released. According to the invention, the mechanism limiting the travel consists of two resilient rings (16, 18), at the outer periphery of each of which a friction mechanism (20, 22) is disposed, and which are disposed, respectively, in an annular groove (24, 26) made in each of the pistons so as to provide a specific axial clearance (d) between a radial wall of the groove and the adjacent side of an assembly consisting of the resilient ring and the friction mechanism, this assembly being provided in order to resist the return springs of the brake shoes in a drum brake.