Abstract: A control apparatus (12) in a brake system (10) has a housing (20) with an inlet port (26), a gear port (32), a relief port (38), and an outlet port (42). A piston (44) located in a first bore (22) has a first peripheral surface (50) with first (52) and second (54) grooves separated by a land (56) and a second bore (60) respectively connected to the first (52) and second (54) grooves by first (62) and second (64) radial passages. A spool (68) which has a peripheral surface (74) with a control groove (76) is connected to a third bore (88) therein by a cross bore or passage (86) and retained in the second bore (60) by a snap ring (96). An input rod (92) which is located in the third bore (88) has a shoulder (94) which engages the spool (68) while an end cap (98) that is connected to the housing (20) retains the piston (44), spool (68) and input rod (92) in the housing (20).

Abstract: A drum-in-hat brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16) by first (18) and second (20) pins connected to the backing plate (16). The first (12) and second (14) brake shoes are aligned on the backing plate (16) by an anchor post (40) and connected to a reverse actuator (26). The reverse actuator (26) receives an input force to respectively move first (42) and second (44) friction pads associated with the first (12) and second (14) brake shoes into engagement with a drum (46) to effect a brake application. The reverse actuator (26) includes a first lever (52) and a second lever (54), each of which have a flat plate (60,76) that extends through an opening (62) in the backing plate (16). A resilient member (90) located in the opening (62) maintains the flat plates (60,76) in a same perpendicular plane with respect to the backing plate (16).

Abstract: A boosted braking system for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The master cylinder (200) causes an increase in pressure of brake fluid supplied to at least one wheel brake (300). The pneumatic booster (100) is controlled by the application of an input force (F2) to a control rod (26) to actuate the master cylinder (200). A main hydraulic piston (30) of the master cylinder (200) has a hollow cylinder (32) in which a reaction piston (34) slides in a leaktight and axial direction. The reaction piston (34) receives at least the input force (F2). An elastic member (46) located between the reaction piston (34) and hollow cylinder (32) exerts an elastic force for urging the reaction piston (34) toward the master cylinder (200). The reaction piston (34) delimits within the cylinder a reaction chamber (36) which is isolated from the interior volume (V) of the master cylinder (200).

Abstract: A tandem master cylinder with a bore (1a) for retaining primary (3) and secondary (4) pistons. The secondary piston (4) has a bearing surface (40) for retaining a ring (10) slideably located between a first spring (8) and a seal (4b). The ring (10) pushes the seal (4b) back against a shoulder (41) on the secondary piston (4) in order to transmit a compressive force to seal (4b). The intensity of the compressive force varies with the force exerted on and transmitted by spring (8). The secondary piston (4) has a stop piece (42) for limiting the sliding of the ring (10) in the direction of the second seal (4b) in the bore (1a) of the master cylinder resulting in better sliding of seal (4b) within bore (1a). The functional relationship between the stop piece (42) and second seal (4b) provided for a substantially total reduction of any pressure difference between the pressurized fluid supplied to a primary and secondary circuits supplied by the master cylinder.

Abstract: A master cylinder having a first housing with an axial bore therein which is connected to a second housing of a reservoir. The axial bore has a first replenishing port surrounded by a first boss and a second replenishing port surrounded by a second boss. A first radial bore in the first boss extends from the first replenishing port while a second radial bore in the second boss extends from the second replenishing port. First and second spigots which extends from the second housing are respectively located in the first and second radial bores to provide first and second flow communication paths from the reservoir to the axial bore.

Abstract: A master cylinder (12) for use in a brake system. The master cylinder (14) has a housing (22) with a bore (20) therein connected by a radial port (28) and an axial port with a reservoir (32) and to the brake system through first (34) and second (36) outlet ports. First (42) and second (44) pistons located in the bore (20) are separated by a first resilient means (46) to define a first chamber (50) while the second piston (44) is separated from the bottom (21) of the bore (20) by a second resilient means (48) to define a second chamber (52). The first and second resilient means (46,48) each include a first spring (90) which is caged between a first retainer (94) and a second retainer (96) by a linkage member (98) and a second spring (92). The linkage member (98) has a head (126) which engages the first retainer (94) and an end (128) which engages the second retainer (96) to hold the first spring (90) between the first (94) and second (96) retainers.

Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100). The master cylinder (200) is equipped with a primary piston (30) which receives an actuating force to increase pressure in a primary hydraulic circuit (I) which increases an increase in pressure in a secondary hydraulic circuit (II) and a secondary piston (31) which is subjected to the hydraulic pressure in the primary circuit (I). The pneumatic booster (100) is controlled by the application of an input force through which an actuation force is applied to the primary piston (30). The primary piston (30) has a hollow cylinder (200) the interior of which is in communication with the primary hydraulic circuit (I). A reaction piston (34) which slides in a leaktigth fashion inside of the hollow cylinder (200) urged toward the master cylinder by a first elastic force provided by a first elastic member (46).

Abstract: A boosted braking device having a master cylinder and a pneumatic booster wherein the force for actuating the master cylinder is derived from a combination of an input force and a boost force of the booster. A main hydraulic piston of the master cylinder has a holler cylinder for receiving the input force. A secondary hydraulic piston located within the holler cylinder of the main hydraulic piston receives a hydraulic reaction force to impart an increasing braking force corresponding to an input force applied over an entire travel of a brake pedal.

Abstract: A boosted braking device for a motor vehicle having a master cylinder (200) and a pneumatic booster (100) operated by applying an input force to an operating rod (26). The booster (100) has a rigid casing (10) which is divided by a partition (16) into at least first (12) and second (14) leaktight chambers. The partition (16) is acted upon via a difference in pressure between the first (12) and second (14) chambers on the opening of a three-way valve (24) to allow pressurized fluid to be communicated to the second chamber (14). A main hydraulic piston (30) which is located in the master cylinder (200) has a hollow cylinder (32) which is in communication with an interior volume (V) of the master cylinder (200). A secondary hydraulic piston (34) slides in a leaktight fashion inside of the hollow cylinder (32).

Abstract: A pressure-regulating solenoid valve (100) for a hydraulic circuit having at least one generator (300) of pressurized fluid, a pressure receiver (200) and a reservoir (400) of fluid under low pressure. The solenoid valve having an electric coil (10) which interacts with first (12) and second (14) pole pieces and a magnetic body (26). The magnetic body (26) moves under the effect of an actuating force (O) generated by a magnetic field created by the electric coil (10) and a distributor element (30) interacting with a sleeve structure (28) to command communication between a duct (66) connected to the pressure receiver and one of first (54) and second (42) ducts sequentially connected to the generator (300) of pressurized fluid or the reservoir (400) of fluid under low pressure.

Abstract: A drum brake (10) having first (14) and second (16) brake shoes retained on a backing plate (20) and moved into engagement with a drum (18) to effect a brake application corresponding to a desired braking input supplied to a actuator member (28) is disclosed. The actuator member (28) has a housing (50) with a first bore (54) therein connected to a cross-bore (56). A pinion (58) located in the first bore (54) has a shaft with first end (60) and a second end (62). The shaft has teeth (58) thereon adjacent the first end (60) and a gear (64) connected to the second end (62). First (74) and second (76) racks which are located in the cross-bore (56) have teeth (67,67') thereon which mesh with the teeth (68) on the pinion (58). A first linkage member (28) connects the first rack (74) with the first brake shoe (14) while a second linkage member (28') connects the second rack (76) with the second brake shoe (16).

Abstract: A master cylinder comprising a cylindrical body (1) which points along a main axis (X). The cylindrical body (1) has a free end (11) and an attached end (12) with a piston rod (2) extending axially from the attached end (12). An impact deflector (3) removably mounted on the cylindrical body (1) covers the free end (11). The impact deflector (3) has at least one deflecting surface (D) which is inclined obliquely to the main axis (X).

Abstract: A disk brake for a motor vehicle having a caliper (1), a carrier (2) which fixed to the vehicle and a pad (41) located between a tip (10) on the caliper (1) and a disk (D). The pad (41) being fitted with a spring (5) which holds the pad against the tip (10) of the caliper (1). The spring (5) bears elastically on inclined surfaces of the tip (10) of the caliper (1) and is subjected to a torque (C--C) which urges the spring (5) to rotate about an axis (X) and to continually urge the spring (5) against the carrier (2).

Abstract: A mechanical actuator (40) for a disc brake assembly (10) to effect a parking brake application. The mechanical actuator (40) includes a housing (62) for retaining an end plate (56) which is rotationally retained in a bore (60) and connected to an end plate (48) which is axially retained in the bore (60). End plate (56) is connected to end plate (48) by a plurality of pivotal connecting rods (50,52,54). The connecting rods (50,52,54) each have an end retained in indentations (74,76,78) in end plate (56) and indentations (75,77,79) in end plate (48). An input applied by lever (46) causes end plate (48) to rotate about an axis (70) of bore (60) and connecting rods (50,52,54) to pivot about indentations (74,76,78) and since end plate (56) is rotationally restrained the force from connecting rods (50, 52,54) is translated into an axial force component which moves end plate (56). The force component varies as a function of angle of rotation of end plate (48).