A method is provided for operating a motor vehicle brake system that includes an actuatable brake master cylinder, a hydraulic brake booster, and at least one brake circuit that has at least one hydraulically actuatable wheel brake and at least one hydraulic-pressure generator driven by electric motor. The method includes monitoring a state of actuation of the brake master cylinder is monitored, and, upon detecting a maximum state of actuation, activating the hydraulic-pressure generator to increase the hydraulic pressure adjusted by the brake master cylinder in the brake circuit.

The present disclosure relates to a brake device for a vehicle, and a main object of the present disclosure is to provide a brake device for a vehicle which can stably perform an electric parking braking cooperative control process for dynamic parking braking in a state in which the brake device enters a backup mode due to an abnormality or a malfunction generated in a device related to an electric booster in a vehicle equipped the electric booster. In order to achieve the above object, a brake device including a fallback valve which is provided on a hydraulic pressure supply line connected to a wheel brake of a wheel on which an electronic parking brake is installed, and which is configured to selectively shut off brake liquid pressure supplied to the wheel brake, and a method for controlling the same are disclosed.

A communications system is described for a hydraulic brake system, including a communications bus, a connected, first control device, a connected, second control device, and a further connected communications unit. In response to a loss of its communication with the first control device in spite of its regular communication with the at least one further communications unit, at least one instance of functional impairment of the first control device and/or of a first motorized device controlled by the first control device is detectable with the aid of the second control device. A hydraulic brake system for a vehicle, a method for checking a communications system, and a method for operating a hydraulic brake system of a vehicle, are also described.

A master brake cylinder for a braking system of a motor vehicle, including a hydraulic cylinder which includes multiple hydraulic connections and in which at least one hydraulic piston is mounted axially displaceably in an actuating direction and in a relief direction, the hydraulic piston being displaceable in the actuating direction against the force of a spring element, and a restraint which limits the maximum spring relief being assigned to the spring element. The restraint includes a restraining cylinder and a restraining piston mounted axially displaceably in the restraining cylinder, the restraining cylinder having at least one lateral-wall opening so that an interior of the restraining cylinder is connected to an interior of the hydraulic cylinder.

A motor vehicle with a first and a second wheel; a control member, which can be activated; a first and a second braking device, which can be operated by means of the control member; and a braking control system, which is connected to the control member and is provided with a first fluidic line and with a second fluidic line connected to the control member and to a first a first and a second chamber of the first braking device; a third fluidic line fluidically connected to one of the first and the second chamber; and a control valve, which can be moved between a first position, in which it connects the third fluidic line to the second fluidic line and isolates the second fluidic line from the second chamber; and a second position, in which it isolates the third fluidic line from the second fluidic line and connects the second fluidic line to the second chamber; and a control unit programmed to acquire an operating state of the control member and a plurality of operating parameters of the motor vehicle and to move the control valve from the second position to the first position for a limited amount of time.

A brake system for a motor vehicle. The brake system includes an autonomous emergency braking system to ascertain an object list using sensor data and continuously update the object list based on newly added sensor data, to ascertain a braking event based on the object list at a first point in time and to activate the actuating device to generate a hydraulic force if a braking event is ascertained, to recognize whether the braking event is still present based on the updated object list at a second point in time, after the first point in time; and to activate the hydraulic unit directly to reduce the hydraulic force applied to at least one wheel brake of the motor vehicle if the braking event is no longer present.

A pneumatic brake booster having a booster housing. The booster housing has at least two thin-walled shell elements and an elastomer sealing element. The sealing element has a sealing bead, which is of encircling form radially at the outside, and at least one rolling diaphragm portion which adjoins the sealing bead. The sealing bead is sealingly clamped in a clamping space between the shell elements. The clamping space is formed by walls which are generated in the shell elements by deformation, its radial inner wall formed by a tubular, axially forwardly extending projection, which is folded at its front edge, of the second shell element. It is proposed that a bead-side rear wall of the clamping space is formed by an encircling, radially outwardly projecting collar which is formed on the second shell element.

A brake system may include an actuating device, in particular a brake pedal; a first piston-cylinder unit having two pistons subjecting the brake circuits to a pressure medium via a valve device, wherein one of the pistons can be actuated by the actuation device; a second piston-cylinder unit having an electric motor drive, a transmission at least one piston to supply at least one of the brake circuits with a pressure medium via a valve device; and a motor pump unit with a valve device to supply the brake circuits with a pressure medium. The brake system may also include a hydraulic travel simulator with a pressure or working chamber which is connected to the first piston-cylinder unit.

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 brake system may include an actuating device, in particular a brake pedal; a first piston-cylinder unit having two pistons subjecting the brake circuits to a pressure medium via a valve device, wherein one of the pistons can be actuated by the actuation device; a second piston-cylinder unit having an electric motor drive, a transmission at least one piston to supply at least one of the brake circuits with a pressure medium via a valve device; and a motor pump unit with a valve device to supply the brake circuits with a pressure medium. The brake system may also include a hydraulic travel simulator with a pressure or working chamber which is connected to the first piston-cylinder unit.