Abstract: The invention concerns a mechanism for actuating a disc brake, incorporating a piston (5) coupled to a brake pad (1), a wedge (12) which is moveable longitudinally, under the action of a control rod (10), between surfaces (5a, 17a) forming part of the piston (5) and of a reaction component (17), respectively, and a pair of rollers (13) situated on each side of the wedge (12) and able to roll between the surfaces (12a, 12b) of the latter and the surfaces of the piston (5) and of the reaction component (17). The space in which the wedge (12) and the rollers (13) move is confined in a closed hydraulic chamber (17). The control rod (10) actuating the wedge forms a penetrating piston which determines variations of volume in this chamber (7) producing a hydraulic thrust upon the piston (5). The corresponding displacement of the latter is slightly greater than that which the wedge (12) would communicate to it mechanically through the intermediary of the roller (13), for the same displacement of the control rod (10).

Abstract: The disc brake incorporates a caliper (28) formed of two axially opposed beams (38, 40) and of two arms which are circumferentially spaced and which define a radial opening for the mounting/removal of friction components (56-62). The caliper incorporates a third arm (64) lying above the opening and mounted, so as to hinge about a shaft (68), on one (40) of the beams, members (66, 76, 78) being provided to join rigidly the third arm to the other (38) beam. An assembly is provided, for example an eccentric assembly, in the region of the shaft (68), to join the third arm to the caliper recovering the manufacturing tolerances of the brake.

Abstract: The correcting valve comprises two identical parallel pistons which control the opening or closing of two valves which are disposed between two inputs and two outputs of two braking circuits. Two thrust members which are subjected to a control pressure urge the pistons in the direction for opening the valves. Two reaction springs co-operate with two transmission members for urging the thrust members in the opposite direction. When the two brakes circuits are supplied, the correcting valve has an identical cut-off pressure for the two circuits. In the event of failure of one of the circuits, the transmission members come into mutual engagement, resulting in a doubling in the cut-off pressure in the circuit which is still intact. The invention is used for dual-circuit braking systems for motor vehicles.

Abstract: A braking correction device has a stepped bore which is divided into an inlet chamber and an outlet chamber by a piston. A control valve is disposed in a passage of the piston and is normally open when the piston occupies a rest position. When the pressure in the inlet chamber rises, the control valve remains open until such pressure has reached a predetermined value, and fluid communication between the inlet and outlet chambers through said control valve is metered when the pressure in the inlet chamber increases above said predetermined value. The piston is urged towards its rest position under the influence of a return force delivered by a control member connected to the suspension of the vehicle, and abutting the piston at its outer end. The inlet and outlet chambers can also communicate by a passage defined between the outer periphery of the piston and the inner surface of the bore.