A brake modulator (1) for a compressed air braking system (80) of a vehicle is disclosed. The brake modulator (1) has a main housing (8) and two relay valves (2, 3). Each relay valve is configured with a delivery valve seat (31, 131) and a vent valve seat (30, 130) and a vent position, wherein compressed air inlets (2d, 3d) are connected via a transverse bore (27) to a common compressed air inlet port (25, 26), and a delivery duct (12a, 112a) extends in the axial direction (A) in each relay valve (2, 3). The relay valves (2, 3) have guide body inserts (12, 112) which are inserted into a longitudinal bore (29) of the main housing (8), which longitudinal bore (29) extends in the axial direction (A), and the relay valves (2, 3) in each case have the delivery duct (12a, 112a).

A master cylinder and an electronic brake system including the same are disclosed. The electronic brake system includes a main hydraulic-pressure supply device to generate hydraulic pressure by sensing displacement of a brake pedal and a sub hydraulic-pressure supply unit to supply hydraulic pressure to at least one wheel cylinder during an abnormal operation of the main hydraulic-pressure supply device. The master cylinder includes a first piston disposed in a bore of a cylinder body so as to be directly pressurized by the brake pedal, a first hydraulic chamber pressurized by the first piston to discharge hydraulic pressure, a second piston indirectly pressurized by the first piston, and a second hydraulic chamber pressurized by the second piston to discharge hydraulic pressure. The second hydraulic chamber includes a slippage prevention means connected to the sub hydraulic-pressure supply unit so as to prevent the second piston from moving toward the first piston by the hydraulic pressure received from the sub hydraulic-pressure supply unit.

A braking system for vehicles having a master cylinder, and at least one braking device. The master cylinder has a first and a second output circuit, containing the same brake fluid. The first output circuit is intercepted by a first control valve fluidically connected to a braking simulator and to the at least one braking device so as to alternately connect the first output circuit to the braking simulator or to the at least one braking device for its actuation. The second output circuit is fluidically connected to the at least one braking device for its actuation, an automatic hydraulic actuation unit operatively connected to the master cylinder by a hydraulic actuation circuit containing an actuation fluid distinct from the brake fluid and fluidically separated from this. And, at least a processing and control unit of the system that supervises the operation of the braking systems.

A braking system for vehicles having a master cylinder, and at least one braking device. The master cylinder has a first and a second output circuit, containing the same brake fluid. The first output circuit is intercepted by a first control valve fluidically connected to a braking simulator and to the at least one braking device so as to alternately connect the first output circuit to the braking simulator or to the at least one braking device for its actuation. The second output circuit is fluidically connected to the at least one braking device for its actuation, an automatic hydraulic actuation unit operatively connected to the master cylinder by a hydraulic actuation circuit containing an actuation fluid distinct from the brake fluid and fluidically separated from this. And, at least a processing and control unit of the system that supervises the operation of the braking systems.

A braking system for vehicles having a master cylinder, and at least one braking device. The master cylinder may be provided with a first and a second output circuit, containing respectively a first and second brake fluid. The first output circuit may be fluidically connected to a braking simulator and the second output circuit may be fluidically connected to the at least one braking device for its actuation. An automatic hydraulic actuation unit operatively connected to the master cylinder by a hydraulic actuation circuit traversed by an actuation fluid distinct from the first and second brake fluid may be provided. A processing and control unit of the system that supervises the operation of the braking systems may also be provided.

The invention relates to an emergency braking device comprising an actuator (2), a pressurizing circuit (3) supplying the actuator (2) via a control pressure and a discharge circuit (4), characterized in that the discharge circuit (4) comprises means (13, 14) for controlling the pressure and/or flow rate of the supply fluid of the actuator (2) during a discharge of the actuator, these control means (13, 14) being configured to define an intermediate pressure between a low pressure level and the control pressure of the actuator (2).

When a brake system on a commercial vehicle, lateral acceleration and/or yaw of the vehicle are monitored and compared to a first predetermined threshold. If the first predetermined threshold is exceeded, a precharge command is sent to the brake system to precharge one or more air chambers by temporarily deactivating a modulator valve and activating an antilock traction relay valve in order to charge the air chambers up to a level permitted by the modulator valve. Upon detecting a panic braking event, a command signal is sent to the brake system to release the precharged air to facilitate braking.

When a brake system on a commercial vehicle, lateral acceleration and/or yaw of the vehicle are monitored and compared to a first predetermined threshold. If the first predetermined threshold is exceeded, a precharge command is sent to the brake system to precharge one or more air chambers by temporarily deactivating a modulator valve and activating an antilock traction relay valve in order to charge the air chambers up to a level permitted by the modulator valve. Upon detecting a panic braking event, a command signal is sent to the brake system to release the precharged air to facilitate braking.

A hydraulic block of a slip regulation of a hydraulic vehicle power brake system that has a master brake cylinder bore and forms a master brake cylinder. In order to prevent a hard impact of a piston of the master brake cylinder against an end stop when the master brake cylinder is released, in particular when there is an abrupt release, for example when the foot slides off a foot brake pedal, a hydraulic return damper that is integrated in the piston is provided.

According to the embodiment of the present disclosure, it provides an inspection valve installed at a flow path connecting a reservoir to a chamber of a master cylinder, comprising: a housing at which a bore is formed and having one side at which an inlet hole is formed; a plunger provided to be movable along the bore of the housing; a seat member configured to close one side of the bore and through which an outlet hole passes; and an elastic member having one side supported by the plunger and the other side supported by the seat member, wherein the plunger is provided to block the outlet hole when a hydraulic pressure flowing in through the inlet hole is greater than an elastic force of the elastic member. Also, according to the embodiment of the present disclosure, it provides an inspection valve installed at a bypass flow path connecting a front side of a check valve to a rear side thereof at a reservoir flow path connecting a reservoir to a master cylinder, comprising: a housing at which a bore is formed and having one side at which an inlet hole communicating with the master cylinder is formed; a plunger provided to be movable along the bore of the housing; a seat member configured to close one side of the bore and through which an outlet hole communicating with the reservoir passes; and an elastic member having one side supported by the plunger and the other side supported by the seat member, wherein the check valve is provided at the reservoir flow path and enables fluid to flow in a direction from the reservoir to the master cylinder, and the plunger is provided to block the outlet hole when a hydraulic pressure flowing in through the inlet hole is greater than an elastic force of the elastic member.