Abstract: A control arrangement of a hydraulic vehicle braking system provided with antiskid control equipment includes a master cylinder device which is actuatable by a brake pedal and is provided with at least one master piston cooperating with an associated replenishment chamber. The replenishment chamber is hydraulically connected through a substantially radial bore with the secondary side of the master piston. An axially displaceable circumferentially sealed positioning piston is disposed at the secondary side of the master piston, and a piston rod of the master piston concentrically and sealingly passes through the positioning piston.

Abstract: An arrangement for controlling the pressure in brake actuating cylinders incorporated in a hydraulic vehicle braking system which is supplied with auxiliary energy includes a master cylinder device having at least one master piston accommodated in a bore communicating with a replenishment chamber. A brake pedal actuated control valve device is arranged between the master cylinder device and the brake pedal and controls the supply of auxiliary energy from an auxiliary energy supply source through a hydraulic conduit to the replenishment chamber. Electromagnetically actuatable control valves are included in the braking circuit and locking of the wheels by controlling the operation of the wheel brake actuating cylinders. Furthermore, there is provided a return conduit to a hydraulic reservoir which incorporates a normally open hydraulic shutoff valve which closes when the pressure of the auxiliary energy drops below a predetermined threshold value.

Abstract: Pressure control systems for a pressure accumulator are known in which the pressure accumulator is fed by a controllable pump. When the pressure accumulator serves to supply at least two user components each requiring a different minimum feed pressure for correct operation, it is desired to provide a pressure control system which is safe in its mode of operation, simple in its construction and needs little energy for maintaining the feed pressure.

Abstract: A brake unit for automotive vehicles includes a low-pressure brake booster and hydraulic tandem brake master cylinder fastened thereto between the splashboard of the vehicle and the brake booster. The brake pedal force is transmitted via a pressure sleeve extending through a primary piston and a secondary piston of the master cylinder onto a control valve disposed inside the booster. The boosting force generated by a movable wall of the booster is transmitted via an annular reaction disc of elastic material, which is disposed in a hub member of the movable wall, via an adjustable stop nut onto a central tie rod. The tie rod at the pedal-side end thereto is in engagement with the primary piston of the master cylinder by means of a radial extension.

Abstract: A brake booster for automotive vehicles includes a low-pressure casing which is sealingly subdivided into a low-pressure chamber and a working chamber by an axially movable wall. The low-pressure chamber includes a casing port adjacent the low-pressure chamber and a portion of the splashboard of the automotive vehicle to which the casing part adjacent the low-pressure chamber is secured at an outer annular sealing surface of the portion of the splashboard in a sealed relationship thereto. Located at the portion of the splashboard is an inner annular sealing surface to which the end of a central reinforcement tube for the low-pressure casing adjacent the working chamber is sealingly connected.

Abstract: A hydraulic braking system, particularly for motor vehicles equipped with anti-skid devices, includes a housing having at least one chamber accommodating a pressure control unit controlling the pressure of hydraulic fluid admitted into brake circuits leading to respective brake-operating cylinders. The pressure control unit includes an actuating piston which subdivides the chamber into an actuating compartment, a working compartment, a supply compartment therebetween which is sealed from the actuating compartment and communicates with the working compartment through a gap between the piston and the housing, and another compartment at the end of the piston remote from the working compartment. An auxiliary piston is accommodated in the last-mentioned compartment and subdivides the same into two spaces into one of which the auxiliary pressure is admitted at the same time that it is admitted into the supply compartment.

Abstract: A pressure reducer for hydraulic brake systems comprising a valve formed by the head of a spring-loaded piston and by a sealing ring which is urged by a spring against a step of the housing. Arranged between the spring and the sealing ring is an engaging plate which is carried along by the piston after the piston has travelled an amount smaller than the valve stroke. This results in an exactly defined valve stroke and at the same time results in a quick opening of the valve upon decrease of the inlet pressure.

Abstract: A hydraulic booster comprising a booster piston, an annular piston bearing against the booster piston and a central piston which is movable within limits relative to the annular piston by the brake pedal to control flow of a pressurized fluid. The central piston and the annular piston are coupled together to move as a unit after the force of a spring is overcome. The central piston is subject to the pressure acting on the booster piston. In order to reduce the force reaction on the brake pedal, the central piston is operated by the brake pedal through a pin subjected to the pressurized fluid, the pin extending centrally through the annular piston in a sealed relationship thereto.

Abstract: Brake systems having an antiskid control apparatus are known in which pressure fluid is additionally supplied from a dynamic circuit into the static brake circuit when pressure fluid has been taken therefrom due to an antiskid control operation. In this situation, the known systems were not able to maintain the master cylinder pressure at a constant value. Therefore, according to the present invention a valve device is provided which is acted upon by the static master cylinder pressure in the opening direction and by the dynamic auxiliary pressure in the closing direction.

Abstract: A floating caliper disc brake comprising a brake support with two arms projecting over the edge of the disc, a brake caliper extending between the arms and embracing the disc, and brake shoes arranged on opposite sides of the disc. The caliper is supported radially inwardly at the arms and the brake shoes are supported radially outwardly at the arms. The brake shoes and the caliper are connected to and maintained in their position at the arm of the brake support by a detachable holding arrangement.

Abstract: Hydraulic brake systems are known which include master cylinders, wheel brake cylinders and wheel slip control apparatus in which a fluid flow from a fluid source to the pressure chamber of the master cylinder is controlled by a valve device. The wheel slip control apparatus controls valves and modulates the pressure in the associated wheel brake cylinder in the event of an imminent locked condition of a wheel. In the known systems the cup seal of the master cylinder is subjected to excessive loads and, moreover, it is not possible to determine if the cup seal leaks.

Abstract: To reduce the overall weight of a vacuum brake booster, the booster housing is provided with an axially extending central tube connecting the end walls of the housing in order to transmit the occurring axial forces. Two separate pistons are provided, a differential pressure piston surrounding the tube and a control valve piston disposed in the bore of the tube. Both pistons are connected with one another by radial pins extending through axial slots in the tube. The differential pressure piston is sealed by a diaphragm which progressively covers the slots when this piston moves in an operational direction. This arrangement reduces the axial length of the booster housing.

Abstract: Hydraulic brake systems are known including a master cylinder, wheel brake cylinder and antiskid control apparatus in which a fluid flow from a fluid source to the pressure chamber of the master cylinder is controlled by a valve device. The antiskid control apparatus activate valves to modulate the pressure in the associated wheel cylinders in the event of an imminent locked condition of a wheel. The known valve devices are complicated and do not permit determining the operability of the brake system before reaching a change-over point. To obviate these disadvantages, the valve device of the present invention feeds pressure from an auxiliary circuit in case of a corresponding decline in pressure from the master cylinder to the wheel cylinders. In the inactive state of the valve device, a pressure fluid connection is opened between a chamber defined by a booster piston and a fluid reservoir and this connection is closed upon actuation of the valve device, i.e.

Abstract: An improved hydraulic control unit for brake systems incorporating antiskid control apparatus which eliminates impacts on the brake pedal during an antiskid regulation cycle, which is of simpler design than known prior art and which requires less accumulator energy includes a control piston disposed on and spaced from the inlet chamber side of an outlet piston and a piston shaft connected between the outlet piston and the control piston. The control piston defines one boundary of a reaction chamber and a spring disposed in a control chamber disposed on the side of the control piston remote from the outlet piston prestresses the control piston and the outlet in the direction of an outlet chamber disposed on the side of the outlet piston remote from the inlet chamber. A reaction piston defining on one end thereof the inlet chamber and on the other end thereof the other boundary of the reaction chamber is slidably disposed on the piston shaft.

Abstract: A two-circuit vacuum brake booster in which two pressure chambers are disposed in tandem with respect to each other, are atmospherically separated from each other and are controlled by its own valve arrangement. The two valve arrangements are arranged in a single control hub one behind the other and are simultantously controlled since their pistons are mechanically rigidly connected with one another.

Abstract: A multiple circuit master cylinder comprising a plurality of master cylinders arranged in tandem with the pressure in each individual master cylinder being hydraulically controlled independently of the pressure in the other master cylinders. The master cylinder piston of each master cylinder has an extension thereon which is guided in a sealed manner through a transverse housing wall to be close to the piston of the adjacent master cylinder such that should the hydraulic energy fail, all master cylinders are mechanically operated by the brake pedal.

Abstract: A power brake unit for automotive vehicles comprising a brake valve through which pressure-transmitting fluid is metered from a fluid source into a booster chamber to actuate a booster piston. A hydraulic transmission ratio provided by an input piston connected to a brake pedal and an operating piston connected to the brake valve reduces the pedal actuating travel when the fluid source is intact and is ineffective in the event of a failure of the fluid source. Only non-boosted forces are transmitted through the hydraulic transmission ratio. Should the fluid source fail, the hydraulic transmission ratio is rendered inoperative in a simple and safe manner.

Abstract: A floating-caliper spot-type disc brake for automotive vehicles comprising a support member having two arms extending over the edge of the brake disc, each arm having a longitudinal bore for receiving a guiding pin, a caliper member disposed between the two arms embracing the disc and two brake shoes each adjacent a different side of the disc, and two guide pins connected to the caliper member and slidably received in the bores for holding the caliper member in its operating position relative to the disc, each of the two guide pins having a spherical sliding surface engaging the cylindrical inner surface of an associated one of the bores to ensure self-alignment of the caliper member.

Abstract: A brake valve comprising two coaxial, tandemly arranged control spools each connecting a different one of two brake circuits to either an associated pressure fluid source or an associated unpressurized reservoir. A first of the two control spools is actuated mechanically by a brake pedal and the second of the two control spools is actuated by the brake pressure controlled by the first of the two control spools. In order for the second of the two control spools to meter the same pressure into the associated brake circuit as the first of the two control spools, the second of the two control spools has two additional effective surfaces, one of which is acted upon by the brake pressure controlled by the first of the two control spools in the direction of actuation and the other of which is acted upon by the brake pressure metered into that one of the two brake circuits controlled by the second of the two control spools.

Abstract: A master cylinder includes a master cylinder piston which is slidable by a booster with a hydraulic transmission interposed between the booster and the master cylinder piston. The booster includes two booster pistons the first of which has the same effective area as the master cylinder piston. With the system intact, the master cylinder piston is shifted as a result of the pressure fluid displaced by the two booster pistons to provide the hydraulic transmission. In the event of failure of the booster, the master cylinder piston is actuated directly by mechanical means through the first booster piston with the hydraulic transmission thereby being omitted.