Abstract: A hydraulic brake system for automotive vehicles has a master brake cylinder (1) operable by a brake pedal, wheel brakes (VL, HR, VR, HL) being connected to said master brake cylinder via brake lines (11, 12), and a hydraulic power booster (22) supplied by a pressure medium source (42) and connected between the brake pedal and the master brake cylinder (1) so as to boost the actuating force. The booster has a booster piston (27) in a booster chamber (28) and the pressurization of said booster piston is controllable by the brake pedal via a control piston (30). For controlling the brake system by means of a brake slip control device the connection from the brake lines (11, 12) to the wheel brakes can be blocked by solenoid valves (13-16). The booster piston (27) is connected with a resetting piston which, for pushing the booster piston back into its rest position, is pressurizable via a resetting valve (46, 53) controllable by the brake slip control device.

Abstract: A hydraulic brake system includes a hydraulic power booster (11) and a master cylinder (12) connected downstream of the power booster (11). The pressure chamber (21) of the power booster (11) is pressurized by an auxiliary pressure which is dependent on the position of a pedal-actuated brake valve (19). A fast-fill cylinder (40) is can be pressurized by the dynamic pressure and with its aid the working chamber (16) of the master cylinder (12) can be supplied with additional pressure fluid in the initial phase of braking. The chamber (48) between the two piston steps (57, 58) of the fast-fill cylinder connects to the unpressurized supply reservoir (3) by way of a valve assembly (51) for synchronizing the movements of the master cylinder piston (43) and of the stepped piston (45) of the fast-fill cylinder (40). The valve assembly (51) is furnished with the wheel cylinder pressure as a control variable.

Abstract: A hydraulic brake system with anti-skid control and/or traction slip control has a braking pressure generator (1, 21), a pressure compensation reservoir (4, 4',24, 24', 42), braking pressure control valves (7, 8 V.sub.1 -V.sub.4, AV.sub.1 -AV.sub.4) by which pressure medium can be tapped from the wheel brakes of the controlled wheels in the braking pressure reduction phase. Further, there is provided an auxiliary pressure supply system (10, 10') by which, in case of control, it is possible to supply pressure medium into the wheel brakes. To increase the operational reliability of the brake system, a pressure compensation chamber (18, 28, 28', 28", 39, 39') with a non-return valve (19, 29, 29', 29", 44, 46) connected upstream and opening toward the pressure compensation chamber is inserted into the pressure medium paths from the pressure compensation reservoir (4', 24, 24', 42) to the auxiliary pressure supply system. The outputs of the outlet valves (AV, AV.sub.1 -AV.sub.4, AV.sub.1 '-AV.sub.

Abstract: In a skid-controlled brake system including a diagonal division of the brake circuits (I and II), the wheel brakes (31 to 34), through main brake lines (62, 63) and branch lines (47 to 50), are in communication with the master cylinder (2) of the brake pressure generator (1), with inlet valves (24, 25 and 29, 30, respectively), open in de-energized position, being provided in the branch lines. Moreover, in-flow lines (45, 46) provided with check valves (38, 39) are couupled to the main brake lines (62, 63), through which, in the event of a locking tendency of the vehicle wheels, pressure fluid is delivered by two hydropumps (21, 26) into the brake circuits (I, II) causing the pistons (6, 7) of the master cylinder (2) to be restored against the pedal force (F) and the central control valves (10, 11) located in pistons (6, 7) to be opened thereby enabling pressure fluid to flow off into the tank (20).

Abstract: A hydraulic brake system provided with a wheel slip control means (2) for use with automotive vehicles, comprising a master cylinder (2) pressurizable by a hydraulic force booster (1), wherein valve devices (32,33 and 34, 35, respectively) are provided between the master cylinder (2) and the wheel brakes (25, 26 and 30, 31, respectively) connected to the master cylinder. Pressure fluid is dischargeable through the valve devices from the wheel brakes 25, 26 and 30, 31, respectively) with pressure fluid discharged from the wheel brakes being replenishable by pressure fluid from the pressure chamber (10) of the hydraulic force booster (1) or an auxiliary pressure source (49). During the slip control, a stroke movement of the pedal brake (8) is effected in order to enable the hydraulic brake system to be employed both as a brake-slip-controlled system (ABS-system) and as a traction slip-controlled system (TSC-system).

Abstract: The present invention is concerned with an electrical switching mechanism for circuits associated with hydraulic systems in automotive vehicles. The switching mechanism comprises at least one switch (13, 15) disposed on a printed circuit board (1), which switch (13, 15) includes a sliding contact (23, 24) fixed to a hydraulically movable carrier (25). The sliding contact (23, 24), along its path of displacement, in various positions (27, 28, 29, 51), between contacts (11, 12; 14, 16) stationarily disposed on the printed circuit board in oppositely spaced relationship, provides for electrically conductive connection or disconnection.

Abstract: A hydraulic brake system with a master cylinder actuatable by a brake pedal (44) by the intermediary of a power booster (1) and with valve means interposed between the master cylinder (3) and the wheel brakes (18, 19, 20, 21) connected thereto. Pressure fluid can be removed from the brake circuits (13, 14) and replenished subsequently out of an auxiliary-pressure source (4, 52, 53). An auxiliary piston (38, 64) is located between the force-output member (2) of the power booster (1), on the one hand, and the piston (31, 36) of the master cylinder (3), on the other hand, for the purpose of generating a controlled pressure, at the end of which auxiliary piston close to the master cylinder piston (31, 36) a duct (49) is provided which is closable by a valve ball (41) that cooperates with the portion of the master cylinder piston (31) close to the auxiliary piston (38).

Abstract: A hydraulic brake system with slip control for automotive vehicles, comprising a master cylinder (2) pressurizable by a hydraulic power booster (1). The brake system further comprising valve elements (28, 29, 33, 36, 37, 38) which are disposed between the master cylinder (2) and the wheel brakes (30, 31, 34, 35), through which valves pressure fluid can be removed from the wheel brakes (30, 31, 34, 35) and replenished out of the pressure chamber (10) of the hydraulic power booster (1) through a change-over valve (26, 27, 42) controllable by a slip-monitoring arrangement (40). During a braking action after the first response of the slip-monitoring arrangement, further actions of pressure decrease and pressure increase in the wheel brakes are controllable by way of the pressure chamber (10) of the hydraulic power booster.

Abstract: A brake slip control apparatus fed with auxiliary energy for use in a vehicular hydraulic brake system, comprising a master-cylinder assembly (12) actuatable by the brake pedal, and with auxiliary energy being supplied into the working chamber (16) of the master cylinder. A resetting piston (49) is arranged axially slidably between stops on the secondary side of the master cylinder piston (23), which piston (49) causes the master cylinder piston (23) to assume a defined position in the event of application with auxiliary energy. To this end, the resetting piston (49) is slidably supported in an annular chamber (47) and, on brake actuation after having overcome a clearance (X), is entrained by the booster piston (57) in the actuating direction. Terminating into the annular chamber (49) is a throttle bore (46) through which pressure fluid out of the annular compartment (36) may enter into the annular chamber (47) in order to urge the resetting piston (49) back to its initial position.

Abstract: A hydraulic brake system for automotive vehicles with at least one load sensor (41) sensing the load condition of the vehicle and with at least one sensor (14, 15, 21, 22) associated wtih each vehicle axle for the detection of a braking parameter decisive for the braking operation. The measured values sensed are supplied to an electric evaluation circuit (18) which during a braking operation permanently computes suitable braking pressure values for the wheel brakes (3, 4) of the rear axle and delivers corresponding control signals to a braking pressure modulator (31, 53, 54). A braking force sensor (14, 15, 21, 22) is associated with at least one vehicle wheel (12, 13, 19, 20) of each vehicle axle.

Abstract: A vehicle hydraulic brake system with slip control, wherein a master cylinder (2) is pressurizable by a hydraulic poser booster (1). Valve means (23, 24, 29, 28, 32, 33, 34, 35) are inserted between the master cylinder (2) and the wheel brakes (25, 26, 30, 31) connected to the master cylinder (2), which valve means serve to remove pressure fluid from the wheel brakes (30, 31, 25, 26). Pressure fluid taken from the wheel brakes is replenished out of the pressure chamber (10) of the hydraulic power booster (1). A stroke limitation of the brake pedal (8) is effected during slip control. To simplify the design of the braking pressure generator (1, 2), the end surface of the master cylinder piston (5) close to the working chamber (16) is larger than the effective surface of the booster piston (4), and that a stepped piston is employed as master cylinder piston (5), an annular surface of said master cylinder piston (5) being adapted to be acted upon by the pressure prevailing in the working chamber (16).

Abstract: A hydraulic brake system with slip control, in particular for automotive vehicles, comprising a master cylinder (2) actuatable by a hydraulic power booster (1), in which brake system valve means (23, 24, 28, 29, 32, 33, 34, 35) are inserted between the master cylinder (2) and the wheel brakes (25, 26, 30, 31), connected to the master cylinder (2) which allow to remove pressure fluid from the wheel brakes (25, 26, 30, 31), while the pressure fluid taken from the wheel brakes (25, 26, 30, 31) can be replenished out of the pressure chamber (10) of the hydraulic power booster (1), wherein the master cylinder piston (5) is designed as a stepped piston and an annular surface (18) of the master cylinder piston (5) remote from the working chamber (16) is adapted to be acted upon by the pressure of the working chamber (16), and wherein the chamber (19) confined by the annular surface (18) is connectible to an unpressurized supply reservoir (11) by way of a travel-responsively controllable valve (51).

Abstract: A hydraulic vehicle servo brake comprises a master cylinder (11) accommodating at least one stepped main-piston assembly (12). A booster piston (12') is provided which is acted upon by a controlled pressure with the controlled pressure being delivered by a brake valve (29) governed by the brake pedal. When the brake pedal (13) is not depressed, a valve contained in an annular chamber is opened and connects the annular chamber to the supply reservoir. In the event of slight advance movement of the main-piston assembly (12), the valve (20) will close. In this case, a wheel-slip brake control unit will shut off the annular chamber (19) hydraulically towards the outside. To accomplish a compact design, the booster piston (12') and the tapered main piston part (12") are united to form an integral piston (26) of constant diameter.

Abstract: The present invention is related to an electric switch comprising a magnet and a reed contact which is actuatable by the magnetic force of the magnet. The reed contact is shielded relative to the magnetic field of the magnet by means of a bell of magnetic field absorbing material which is furnished with an opening in the switching range of the reed contact to permit switch actuation. Exact switching points at the reed contacts are achieved by this arrangement.

Abstract: A pressure control device to be inserted into a connection between a front wheel brake and a rear wheel brake which determines the rear brake hydraulic pressure in dependence upon front brake hydraulic pressure. The pressure control device provides a plurality of valve pistons hydraulically connected in parallel and displaceable by front axle hydraulic pressure in opposition to a control force. A predetermined change-over hydraulic pressure develops a braking pressure in the rear brake which is less than the front brake pressure. The valve pistons are provided by stepped pistons guided within stepped bores, each of which pistons provides smaller and larger effective pressure surfaces.

Abstract: A plastic compensating reservoir for hydraulic brake systems, such as for brake systems of automotive vehicles, is provided with two interconnected brake fluid chambers which are in communication each other over one port for connection to each one pressure chamber of a tandem master cylinder. To enable manufacture of a like compensating reservoir by one single injection molding process, there is provided a tube which extends transversely to the reservoir's vertical axis and which projects from one of the brake fluid chambers, the said projecting end being adapted to be closed.

Abstract: Compensating brake fluid reservoirs with a brake fluid alarm device are required for master cylinders of hydraulic brake systems in automotive vehicles. A float chamber, which is disposed in a compensating reservoir and surrounds a float, is defined by a tubular body suspended from an upper end of the reservoir and a bottom element. After insertion of both parts into the reservoir the bottom element cooperates with the lower end of the tubular body such that the float chamber is closed at least to such an extent that the inflow and outflow of the fluid therefrom is inhibited in order to achieve a damping effect. This enables a quick immersion of both parts into the filled reservoir without brake fluid leaking from the reservoir.

Abstract: A fluid reservoir for use with a tandem master cylinder is divided into two compartments by a partition wall with one of the two compartments being directly connected to a first outlet port connected to the master cylinder and the other of the two compartments being connected to a second outlet port connected to the master cylinder disposed in the one of the two compartments by a channel formed within the reservoir extending from the other of the two compartments through the partition wall to the second outlet port. This construction ensures the freest possible arrangement of the first and second ports at the bottom of the reservoir.

Abstract: To provide a space inside the housing of a brake booster for installation of an end portion of a master brake cylinder, the hub member of the booster piston (movable wall) comprising an axial sleeve adapted to embrace an end portion of the master cylinder in the actuated position of the booster and a valve housing extending out of the booster casing opposite to the master cylinder and guided therein, the valve housing including internal longitudinal channels extending from its outer end to a chamber which surrounds the valve housing and leads to the working chamber of the brake booster.

Abstract: In the prior art, a master brake cylinder is connected to a brake booster by a flange and nut and bolt arrangement. According to the present invention the connection can be made with a reduced number of parts and the large flange of the master cylinder can be eliminated. This is accomplished by providing the connecting end of the master cylinder with a circular groove and the adjacent end of a reinforcing tube of the booster is positioned to encompass the grooved end of the master cylinder, the reinforcing tube having protuberances formed therein to grip the circular groove.