A brake system may include a first pressure supply unit having an electromotive drive and arranged to supply pressure medium to first and second brake circuits; a motor-pump unit to supply pressure medium to at least one of the brake circuits; a second pressure supply unit, connected to the motor-pump unit via first and second hydraulic lines and arranged to supply pressure medium to at least one of the brake circuits; and a valve unit. The second pressure supply unit may be connected via a third hydraulic line to at least one of the brake circuits. The valve unit may include at least one feed valve via which the third hydraulic line may be at least partially reversibly shut off. An isolating valve may be disposed in at least one of the hydraulic lines to at least partially reversibly shut off the at least one hydraulic line.

A braking force control apparatus is provided which has an upstream braking actuator for generating an upstream pressure common to four wheels, a downstream braking actuator individually controlling braking pressure supplied to braking force generating devices of the wheels using the upstream pressure, and a control unit. When the downstream braking actuator is abnormal and the upstream pressure can be supplied to the braking force generating devices, but a braking pressure of any one of the wheels cannot be normally controlled, the control unit selects a control mode on the pressure increasing side out of the front wheel control modes, selects a control mode on the pressure increasing side out of the rear wheel control modes, selects a control mode on the pressure decreasing side out of the two selected control modes as a prescribed control mode, and controls the upstream pressure in the prescribed control mode.

A brake system may include an actuation device that may actuate a first piston-cylinder unit to apply pressure medium to at least one brake circuit via a valve device, where a piston of the first piston-cylinder unit separate first and second working chambers; a second piston-cylinder unit, having an electromotive drive and a transmission to feed pressure medium to at least one of the brake circuits via a valve device; and a motor-pump unit having a valve device to feed pressure medium to the brake circuits. The motor of the electromotive drive of the second piston-cylinder unit and the motor of the motor-pump unit may be used jointly or independently of one another, under control of a control device. The motor-pump unit is connected via two hydraulic connections, one or both of which may incorporate separating valves, to the first and second working chambers of the first piston-cylinder unit.

A hydraulic unit of a traction control system of a hydraulic vehicle brake system includes a hydraulic block and an electric motor that is arranged on the hydraulic block and configured to drive hydraulic pumps of the traction control system. The hydraulic block has a valve side that faces away from the electric motor. Solenoid valves, an electronic control unit and electrical plug contacts in a multiple electrical connector are arranged on the valve side. In order to prevent any liquid that has leaked from the electric motor from reaching the valve side, a hollow shaft, through which connection lines of the electric motor are fed, is sealed in a through-hole, which runs from the electric motor to the valve side facing away, by a sealing ring that consists of acrylonitrile butadiene rubber that swells upon contact with brake fluid.

An integrated solenoid valve and a brake system using the same are disclosed. The integrated solenoid valve includes an armature, an elastic member, a magnet core, an orifice unit, a filter member, a lip seal, a bidirectional passage, and a unidirectional passage. The armature is disposed in a sleeve, moves upward and downward in an axial direction, and opens or closes an orifice of a seat disposed at a lower side thereof. The elastic member provides elastic force to the armature in a closing direction of the orifice. The magnet core provides drive force to the armature in a direction opposite to that of the elastic member. The orifice unit is coupled to a lower side of the seat, and includes not only a hollow hole communicating with the orifice of the seat but also a passage hole. The filter member prevents inflow of foreign materials. The lip seal is inserted between the orifice unit and the filter member, and includes an inclined protrusion. The bidirectional passage is opened or closed by the armature moving up and down. The unidirectional passage is formed to pass through the passage hole and an outer surface of the inclined protrusion.

A brake system may include an actuation device, in particular a brake pedal, a first piston-cylinder unit with two pistons, in particular an auxiliary piston and a second piston, in order to supply a pressure medium to brake circuits via a valve device. One of the pistons, in particular the auxiliary piston, can be actuated by means of the actuation device. The brake system may further include a second piston-cylinder unit with an electric motor-powered drive, a transmission, and at least one piston to supply a pressure medium to at least one of the brake circuits via a valve device and a motor-pump unit with a valve device to supply a pressure medium to the brake circuits. According to one aspect, a hydraulic travel simulator is connected to a pressure or working chamber of the first piston-cylinder unit.

A hydraulic motor vehicle braking system comprises an electronic stability control (ESC) system of dual-circuit design, a first brake circuit which acts on one or more first wheel brakes, and a second brake circuit which acts on one or more second wheel brakes. The first brake circuit comprises a first hydraulic pressure generator which is electrically controllable for control interventions, and the second brake circuit comprises a second hydraulic pressure generator which is electrically controllable, independently of the first hydraulic pressure generator, for control interventions.

An electric equipment component of a vehicle having an electric braking/steering device, including: a) an electric steering device with/without a continuous mechanical connection between a steering wheel and a steering gear mechanism, and an electronic steering control device and an electric steering actuator; an electropneumatic service brake device having an electropneumatic service brake valve device, an electronic brake control device, electropneumatic modulators and pneumatic wheel brake actuators; and a device having the electronic evaluation device of the electropneumatic service brake valve device and generating a second activation force independently of a driver's braking request, the further device acting on the control piston in the same or opposite direction to the first activation force when a braking request, independent of the driver's request, is present; the electronic evaluation device being integrated into the electronic steering control device, or the electronic steering control device being integrated into the electronic evaluation device.

A hydraulic brake system for a vehicle includes a master brake cylinder, a hydraulic unit, and multiple wheel brakes. The hydraulic unit Ha at least one brake circuit for modulating the braking pressure in the wheel brakes. At least one wheel brake is paired with a bistable solenoid valve, which is looped into the corresponding fluid channel directly upstream of the paired wheel brake and which enables the braking pressure in the paired wheel brake to be modulated in a de-energized open position and locks the current braking pressure in the paired wheel brake in a de-energized closed position, wherein a volume equalization device which comprises a connectable accumulator opens into the corresponding fluid channel between the bistable solenoid valve and the paired wheel brake.

The present invention pertains to a brake system for a vehicle, in particular a wheeled vehicle, comprising a control unit configured to operate the brake system in an automatic retarding control mode and in a brake assist mode, a brake pedal valve, and at least one brake valve unit for actuating a brake actuator. The break valve unit comprises a brake valve for applying pressurized fluid to the brake actuator in response to a control pressure applied to a hydraulic actuator of the brake valve, a blocking valve for controlling application of pressurized fluid from the brake pedal valve to the hydraulic actuator of the brake valve, and a brake pressure control valve for controlling application of pressurized fluid to the hydraulic actuator of the brake valve.