An electric braking device includes a plurality of electric cylinder devices and a circuit board that controls an electric motor of the electric cylinder devices. The plurality of electric cylinder devices and are disposed adjacent to each other in an alignment direction that is a radial direction of pistons with shaft lines of the pistons parallel to each other. The circuit board is disposed adjacent to the plurality of electric cylinder devices in an orientation in which a board surface of the circuit board is parallel to the shaft lines of the pistons and a longitudinal direction is oriented in the alignment direction.

An electric braking device includes a plurality of electric cylinder devices and a circuit board that controls an electric motor of the electric cylinder devices. The plurality of electric cylinder devices and are disposed adjacent to each other in an alignment direction that is a radial direction of pistons with shaft lines of the pistons parallel to each other. The circuit board is disposed adjacent to the plurality of electric cylinder devices in an orientation in which a board surface of the circuit board is parallel to the shaft lines of the pistons and a longitudinal direction is oriented in the alignment direction.

A brake control device adjusts a hydraulic pressure in a wheel cylinder in response to an operation amount of a brake operation member, and includes a pressure adjustment unit that includes an electric pump and a pressure adjustment valve and adjusts hydraulic pressure in a pressure adjustment fluid path between the electric pump and the pressure adjustment valve, and a controller that controls the electric pump and the pressure adjustment valve. The controller calculates an operation speed equivalent amount based on the operation amount, calculates a target rotation speed based on the operation speed equivalent amount, and controls the electric pump such that an actual rotation speed of the electric pump approaches the target rotation speed.

A brake control device adjusts a hydraulic pressure in a wheel cylinder in response to an operation amount of a brake operation member, and includes a pressure adjustment unit that includes an electric pump and a pressure adjustment valve and adjusts hydraulic pressure in a pressure adjustment fluid path between the electric pump and the pressure adjustment valve, and a controller that controls the electric pump and the pressure adjustment valve. The controller calculates an operation speed equivalent amount based on the operation amount, calculates a target rotation speed based on the operation speed equivalent amount, and controls the electric pump such that an actual rotation speed of the electric pump approaches the target rotation speed.

According to one aspect, a method includes applying a first force to a piston using an actuator that includes a displacement indication arrangement. The piston is part of a hydraulic braking system included in a vehicle. The hydraulic braking system includes fluid, wherein when the first force is applied to the piston, the piston moves. The method further includes determining when a pressure of the fluid reaches a target pressure, obtaining at least a first measurement of a displacement of the piston when the pressure of the fluid reaches the target pressure using the displacement indication arrangement, and determining when the at least first measurement of the displacement of the piston indicates an anomaly in the hydraulic braking system. When it is determined that the at least first measurement of the displacement of the piston indicates the anomaly, the anomaly in the hydraulic braking system is identified.

According to one aspect, a method includes applying a first force to a piston using an actuator that includes a displacement indication arrangement. The piston is part of a hydraulic braking system included in a vehicle. The hydraulic braking system includes fluid, wherein when the first force is applied to the piston, the piston moves. The method further includes determining when a pressure of the fluid reaches a target pressure, obtaining at least a first measurement of a displacement of the piston when the pressure of the fluid reaches the target pressure using the displacement indication arrangement, and determining when the at least first measurement of the displacement of the piston indicates an anomaly in the hydraulic braking system. When it is determined that the at least first measurement of the displacement of the piston indicates the anomaly, the anomaly in the hydraulic braking system is identified.

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 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 trailed vehicle is configured for coupling with a motor vehicle and is adapted to be towed by the motor vehicle. The trailed vehicle includes a frame. At least one axle is rotatably coupled to the frame and carries a pair of wheels. A hydraulic brake system is operably coupled with the motor vehicle and with the wheels of the trailed vehicle. The hydraulic brake system includes a caliper assembly and a manifold assembly provided with the wheels of the trailed vehicle.

A trailed vehicle is configured for coupling with a motor vehicle and is adapted to be towed by the motor vehicle. The trailed vehicle includes a frame. At least one axle is rotatably coupled to the frame and carries a pair of wheels. A hydraulic brake system is operably coupled with the motor vehicle and with the wheels of the trailed vehicle. The hydraulic brake system includes a caliper assembly and a manifold assembly provided with the wheels of the trailed vehicle.