A system and method for performing a diagnostic on a hydraulic system in a vehicle while the vehicle is at a standstill. The method includes, by means of an electronic processor, moving a plunger at a constant rate, determining a position of the plunger, receiving a pressure of the hydraulic system from a pressure sensor, comparing the determined position and the measured pressure to a position versus pressure graph, and sending a diagnostic to a diagnostic indicator.

A brake fluid pressure control device for a vehicle that includes a wheel speed obtaining device to obtain wheel speed, and a vehicle body deceleration calculating means to calculate a vehicle body deceleration on the basis of the wheel speed. If a condition is satisfied in which the vehicle body deceleration continues to stay at a low rate of less than or equal to a predetermined threshold value for a predetermined period of time, the pressure increasing rate in pressure increasing control is altered to a higher value than before the condition is satisfied. The brake fluid pressure of a brake caliper can quickly be brought close to the fluid pressure of a master cylinder. Therefore, it is possible to improve the brake responsiveness when the brake is re-operated by the driver during the ABS control, thereby reducing the driver's feeling of wrongness and strangeness.

A brake fluid pressure control device for a vehicle that can perform fluid pressure control on the brake fluid pressure applied to wheel brakes. It is determined whether the pressure increasing time in the current pressure increasing control exceeds determination time which is set on the basis of the pressure increasing time in past pressure increasing control. If the pressure increasing time in the current pressure increasing control exceeds the determination time, it is determined that the road surface on which the vehicle is travelling has changed from the road surface with a low coefficient of friction to the road surface with a high coefficient of friction.

A system may be configured for controlling an auto vehicle hold (AVH) for a vehicle, which is configured for implementing an AVH function by improving a brake hydraulic circuit, wherein an electronic system for controlling an AVH for a vehicle, in which a pair of AVH valves for implementing an AVH function is additionally formed in a hydraulic brake circuit of an active hydraulic brake (AHB), so that the implementation of the AVH function may be continuously maintained even in a state where an electronic parking brake (EPB) is not mounted.

A pumpless-type brake hydraulic pressure unit comprising a housing that includes a base body, an inlet valve hole accommodating an inlet valve, an outlet valve hole accommodating an outlet valve, a master cylinder port connected to a master cylinder, a reservoir port connected to a reservoir, a wheel cylinder port connected to a wheel cylinder, and a pipeline. The base body includes a first side face, a second side face, and a third side face. The inlet valve hole and the outlet valve hole are open on the first side face, the master cylinder port and the wheel cylinder port are provided on the second side face. The first side face and the second side face are perpendicular to one another, the first side face and the third side face are perpendicular to one another, and the second side face and the third side face are perpendicular to one another.

Example hydraulic brake actuators and related methods are disclosed herein. An example hydraulic brake actuator includes a rotary valve disposed in a bore of a housing. The rotary valve includes a shaft rotatably disposed within a sleeve. The sleeve and the shaft have ports that align at certain rotational positions to create a flow path between the bore and an inner chamber of the shaft. The example hydraulic brake actuator also includes a pump coupled to the shaft to increase and decrease a pressure within the inner chamber of the shaft.

Provided is a hydraulic pressure control device and a braking system, which are capable of increasing a degree of freedom in layout of oil passages inside a housing. The hydraulic pressure control device includes a normally-closed type electromagnetic valve and a normally-open type electromagnetic valve. The normally-closed type electromagnetic valve includes a first valve part arranged so as to extend from a surface of the housing to an inside of the housing, and is configured to close an oil passage when a current is not supplied. The normally-open electromagnetic valve includes a second valve part being arranged so as to extend from the surface of the housing to the inside of the housing and having an axial length set to be equal to an axial length of the first valve part, and is configured to open the oil passage when a current is not supplied.

A work vehicle is provided with a body and ground engaging means configured to allow motion of the body on ground, and braking means for locking ground engaging means, and an operative element carried by said body and configured to execute a specific working operation. The work vehicle further includes a first and a second joystick configured to respectively control the operation of ground engaging means and operative element based on movement of joystick and first and second input means configured respectively to control the activation/deactivation of parking brake functionality of the work vehicle and the activation/deactivation of hydraulic systems of work vehicle. Furthermore, the work vehicle includes a control system configured to receive second and first control signals derived from first and second input means respectively and each configured to assume a respective activation value and a respective deactivation value and inhibit the operation of the joystick linked to the operation of ground engaging means if both control signals are in activation state.

A brake system for a transportation vehicle and a transportation vehicle having such a brake system. The brake system includes two brake circuits which each have a control unit and a battery, wherein the respective control unit actuates two of a total of four service brakes and at least one of at least two electric parking brakes. The brake system also has an electronic circuit element. The brake system forms a defect signal in response to a double fault affecting the two brake circuits and when a defect in at least one of the control units is detected, and/or in which a respective supply voltage of at least one of the control units drops below a predefined limiting value. The at least one electronic circuit element actuates the electric parking brakes when a defect signal is formed.

Provided is a braking device capable of improving ease of layout inside a housing. The braking device includes: a housing, a pump provided in the housing, a suction oil passage provided inside the housing, and connected to a suction part of the pump, and a reservoir provided inside the housing, having an opening for connection to an oil passage outside the housing on an outer surface of the housing. The suction oil passage open in the reservoir. Brake fluid is reserved in the reservoir.