A brake control device includes a brake operation member, a pressurization unit, a master cylinder unit, a connection path connecting a separation chamber and a reaction force chamber, an electromagnetic valve at the connection path, and a control device. The control device includes a specified control section configured to, when the brake operation member is operated in a closed state of the electromagnetic valve, execute activation-time control in which the pressurization unit supplies fluid to a servo chamber based on a predetermined pattern, a determination section configured to determine whether a pressure difference between pressure in the reaction force chamber and pressure in the separation chamber, is equal to or less than a threshold value, and a valve control section configured to open the electromagnetic valve when the determination section determines the pressure difference is equal to or less than the threshold value after start of the activation-time control.

A system for and a method of controlling driving of a continuously-operable electronic vacuum pump includes determining conditions for allowing and disallowing first and second electronic vacuum pumps to operate for each braking situation according to vehicle state information associated with braking. The first and second electronic vacuum pumps are driven individually or concurrently according to the determined braking situation. Thus, an optimal negative pressure optimal suitable for the vehicle state information is easily supplied to a booster.

A system for and a method of controlling driving of a continuously-operable electronic vacuum pump includes determining conditions for allowing and disallowing first and second electronic vacuum pumps to operate for each braking situation according to vehicle state information associated with braking. The first and second electronic vacuum pumps are driven individually or concurrently according to the determined braking situation. Thus, an optimal negative pressure optimal suitable for the vehicle state information is easily supplied to a booster.

The braking device for vehicles includes a reduction amount setting part for setting the amount by which to reduce the revolution of a pump motor during maintenance or reduction of controllable differential pressure so that the reduction amount decreases as the probability increases of needing to discharge the brake fluid by pumps, during a period from when a brake controller begins reducing the revolution until the lapse of prescribed time.

The braking device for vehicles includes a reduction amount setting part for setting the amount by which to reduce the revolution of a pump motor during maintenance or reduction of controllable differential pressure so that the reduction amount decreases as the probability increases of needing to discharge the brake fluid by pumps, during a period from when a brake controller begins reducing the revolution until the lapse of prescribed time.

A brake control device including a pressure adjusting unit including an electric pump and an electromagnetic valve, and that adjusts, using the electromagnetic valve, a brake liquid discharged by the electric pump to an adjusted liquid pressure and introduces the adjusted liquid pressure to the wheel cylinders of the rear wheels; and a master unit that includes a master cylinder and a master piston, and that includes a master chamber connected to the wheel cylinders of the front wheels and a servo chamber to which the adjusted liquid pressure is introduced and which provides, to the master piston, an advancing force that opposes a retreating force applied to the master piston by the master chamber.

A brake control device including a pressure adjusting unit including an electric pump and an electromagnetic valve, and that adjusts, using the electromagnetic valve, a brake liquid discharged by the electric pump to an adjusted liquid pressure and introduces the adjusted liquid pressure to the wheel cylinders of the rear wheels; and a master unit that includes a master cylinder and a master piston, and that includes a master chamber connected to the wheel cylinders of the front wheels and a servo chamber to which the adjusted liquid pressure is introduced and which provides, to the master piston, an advancing force that opposes a retreating force applied to the master piston by the master chamber.

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.

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.

In a method for controlling a hydraulic braking system, wherein the braking system includes a hydraulic pump that is driven by an electric motor so as to generate a volume of fluid flow for the hydraulic braking system. the electric motor is controlled in such a manner that fluid pulsation in the hydraulic braking system is counteracted by means of modulating a rotational speed of the electric motor. The modulation is generated by means of the control procedure. Furthermore, a device is designed and configured so as to perform the method.