Provided are a brake apparatus, a brake system, and a master cylinder that can accurately detect a movement amount of a piston while reducing manufacturing cost. A brake apparatus includes a master cylinder housing including a cylinder therein, a piston provided inside the cylinder and movable in a direction of an axial line of the cylinder, a magnet provided, inside the cylinder, partially in a circumferential direction of the piston, which is a direction around the axial line, and configured to be displaced according to a movement of the piston, a detection portion provided on the master cylinder housing and configured to detect a movement amount of the piston, and a rotation restriction mechanism provided inside the cylinder and configured to restrict a movement of the magnet in the circumferential direction.

The braking device for a vehicle includes an operation judging portion which judges whether or not the operating amount in the increasing stage is equal to or more than a predetermined threshold amount or whether or not an increasing speed of the operating amount in the increasing stage is equal to or more than a predetermined threshold speed and a control portion which selects the first operating mode as the operating mode from a start of the increasing stage until a first timing or a second timing and selects the second operating mode as the operating mode in the increasing stage after the first timing or the second timing and at the same time maintains the drive hydraulic pressure in the increasing stage after the first timing or the second timing.

A control device and method for executing a holding function using a hydraulic braking system of a vehicle including building up an initial holding pressure in at least one wheel brake cylinder using at least one brake pressure buildup device and closing at least one shutoff valve situated between the at least one wheel brake cylinder and the at least one brake pressure buildup device, a new holding pressure being built up in the wheel brake cylinder, in that an intermediate pressure less than the new holding pressure is built up between the shutoff valve and the brake pressure buildup device using the brake pressure buildup device, the shutoff valve is opened upon the presence of the intermediate pressure between the shutoff valve and the brake pressure buildup device, and brake fluid is transferred using the brake pressure buildup device through the open shutoff valve into the wheel brake cylinder.

An auxiliary module for an electrohydraulic brake assembly, in particular for use in highly automated driving, including a hydraulics unit with a pressure provision device for building up pressure in at least two brakes, wherein at least one reservoir for brake fluid is integrated into the hydraulics unit, and a brake assembly system having an auxiliary module.

An abnormality diagnosis device to be used in a vehicle braking device equipped with a low pressure source connected to a reaction force chamber in a predetermined condition, a master cylinder, a drive portion, and a control portion. The abnormality diagnosis device includes: a diagnosis portion for performing an abnormality diagnosis on the basis of the relationship between the reaction force hydraulic pressure and the operation amount of a braking operation member, and/or the relationship between a target value and an actual value; and a judging portion for judging whether or not the reaction force chamber state pertaining to the hydraulic pressure and/or fluid amount thereof is in a predetermined insufficient state or in a predetermined excess state. Furthermore, when the judging portion judges that the reaction force chamber state is in a predetermined insufficient state or in a predetermined excess state, the diagnosis portion stops the abnormality diagnosis.

A pump assembly for generating a brake pressure in a hydraulic slip-controlled power vehicle braking system, including a fluid sensor between an electric motor and a piston cylinder unit with the aid of which a small brake fluid quantity inadvertently leaking from the piston cylinder unit in the form of leakage is ascertainable before it affects a function of an electronic control or the electric motor.

A hydraulic unit, in particular a hydraulic unit for a slip-controllable vehicle brake system, includes a housing block, a pump, and a damping device. The pump has an intake side and a delivery side. The housing block has a pump receptacle that holds the pump, a first fluid duct that intersects the pump receptacle in a region of the delivery side of the pump, and a second fluid duct opening into the pump receptacle in the region of the delivery side of the pump, and a first separation point that seals off the first fluid duct from the second fluid duct. The damping device damps pulsations and reduces operating noise of the hydraulic unit without (i) having a detrimental effect on functional characteristics of the unit, in particular on pressure build-up dynamics of the vehicle brake system, or without (ii) jeopardizing a compact construction of the hydraulic unit.

A hydraulic actuation system for a brake system may include at least one brake circuit including at least one wheel brake, a master cylinder that may be actuated using an actuating device and having at least one working chamber, and a hydraulic travel simulator. The working chamber may be connected via a 3/2-way valve either to a brake circuit or to the travel simulator.

A brake system for a vehicle may include a brake input device configured to apply a brake input of a driver; a brake actuator including a first pump device and a second pump device for supplying a brake hydraulic pressure; a brake adjusting device, which includes a first chamber and a second chamber, and is operated so that the first chamber and the second chamber are connected to or blocked from each other; and wheel cylinders configured to generate brake power for each wheel by the brake hydraulic pressure generated in the brake actuator, wherein the brake adjusting device blocks the first chamber and the second chamber so that a brake hydraulic pressure supplied from the first pump device and a brake hydraulic pressure supplied from the second pump device are blocked from each other.

A vehicle brake system including a hydraulic brake device that includes: a brake actuator including a pump and a two-system electric motor that includes first and second coils; a battery; a first drive circuit for supplying electric power from the battery to the first coil; a capacitor; and a second drive circuit for supplying electric power from the capacitor to the second coil, wherein, in a normal mode in which the pump is driven by power not greater than set power, the motor drives the pump by the electric power supplied from the battery to the first coil, and wherein, in a high power mode in which the pump is driven by power that exceeds the set power, the motor drives the pump by both of the electric power supplied from the battery to the first coil and the electric power supplied from the capacitor to the second coil.