A brake system including a base, a driving motor, a cam, a braking pump, a rotating column, and a bearing shaft. The base has an accommodating space. The driving motor is disposed on the base and located in the accommodating space. The cam is pivoted to the driving motor, and the driving motor is adapted to drive the cam to rotate relative to the base. The braking pump is disposed outside the base. The rotating column is rotatably disposed outside the base and connected to the braking pump. The bearing shaft is connected to the rotating column and extended into the accommodating space so as to radially in contact with the cam.

A brake system including a base, a driving motor, a cam, a braking pump, a rotating column, and a bearing shaft. The base has an accommodating space. The driving motor is disposed on the base and located in the accommodating space. The cam is pivoted to the driving motor, and the driving motor is adapted to drive the cam to rotate relative to the base. The braking pump is disposed outside the base. The rotating column is rotatably disposed outside the base and connected to the braking pump. The bearing shaft is connected to the rotating column and extended into the accommodating space so as to radially in contact with the cam.

An air dryer apparatus is provided for a vehicle air brake charging system. The air dryer apparatus comprises an air dryer governor assembly. The air dryer governor assembly includes a plastic sleeve having an external sleeve surface and an internal sleeve surface that defines a piston bore. The air dryer governor assembly also includes a piston disposed in the piston bore and slidable along the internal sleeve surface between a preset cut-out setting and a preset cut-in setting of the air dryer governor assembly. The air dryer governor assembly further includes one or more ribs disposed on the external sleeve surface to prevent deformation of the plastic sleeve when the piston slides along the internal sleeve surface between the preset cut-out and cut-in settings.

An air dryer apparatus is provided for a vehicle air brake charging system. The air dryer apparatus comprises an air dryer governor assembly. The air dryer governor assembly includes a plastic sleeve having an external sleeve surface and an internal sleeve surface that defines a piston bore. The air dryer governor assembly also includes a piston disposed in the piston bore and slidable along the internal sleeve surface between a preset cut-out setting and a preset cut-in setting of the air dryer governor assembly. The air dryer governor assembly further includes one or more ribs disposed on the external sleeve surface to prevent deformation of the plastic sleeve when the piston slides along the internal sleeve surface between the preset cut-out and cut-in settings.

A hydraulic block for a hydraulic unit for generating brake pressure and regulating brake pressure in a hydraulic vehicle power brake system. The hydraulic block includes a projection that extends the power cylinder bore which passes transversely through the hydraulic block on a large side of the hydraulic block and a projection that extends an anti-rotation guide of a power piston of a power brake pressure generator on an opposite large side of the hydraulic block.

A hydraulic block for a hydraulic unit for generating brake pressure and regulating brake pressure in a hydraulic vehicle power brake system. The hydraulic block includes a projection that extends the power cylinder bore which passes transversely through the hydraulic block on a large side of the hydraulic block and a projection that extends an anti-rotation guide of a power piston of a power brake pressure generator on an opposite large side of the hydraulic block.

A vehicle braking system includes an assistance device, having a vacuum pump driven by an engine for communicating vacuum to a chamber of the assistance device. A control valve is interposed along a fluid line between the pump and the chamber. The control valve is in its first operative condition, where the inlet side of the vacuum pump communicates with the chamber, when the pressure within the chamber is above a predetermined value; and is in its second operative condition, where the inlet side of the vacuum pump communicates with the atmosphere, when pressure within the chamber is below a predetermined value. In this second condition the pump intakes air from and feeds air into the atmosphere, thereby reducing the energy consumption by the engine required for driving the pump during stages where, within the chamber there is a vacuum sufficient for the regular operation of the braking system.

A vehicle braking system includes an assistance device, having a vacuum pump driven by an engine for communicating vacuum to a chamber of the assistance device. A control valve is interposed along a fluid line between the pump and the chamber. The control valve is in its first operative condition, where the inlet side of the vacuum pump communicates with the chamber, when the pressure within the chamber is above a predetermined value; and is in its second operative condition, where the inlet side of the vacuum pump communicates with the atmosphere, when pressure within the chamber is below a predetermined value. In this second condition the pump intakes air from and feeds air into the atmosphere, thereby reducing the energy consumption by the engine required for driving the pump during stages where, within the chamber there is a vacuum sufficient for the regular operation of the braking system.

Provided is a braking device capable of increasing boost responsiveness of wheel cylinders. The braking device includes a second chamber from which a brake fluid is discharged by a movement of a piston caused by inflow of the brake fluid flowed out from a master cylinder to a first chamber through a brake operation by a driver, and a pump configured to discharge the brake fluid into an oil passage for supplying the brake fluid flowed out from the second chamber to a wheel cylinder.

In a hydraulic brake system, when a main power supply is in an abnormal condition in which it cannot supply electric power to a pump motor, etc., the pump motor is operated with electric power supplied from an auxiliary power supply, irrespective of the presence of a braking request. Thus, when the main power supply is in the abnormal condition, the number of times inrush current flows is reduced. As a result, the voltage of the auxiliary power supply is less likely to be lower than an operation minimum voltage, and the hydraulic brake system is less likely to be unable to be operated.