Vehicle braking system

A vehicle braking system for applying braking force to an own vehicle, comprising:

• a master cylinder device that generates a primary hydraulic pressure according to a braking operation by a driver;
• a motor cylinder device that generates a secondary hydraulic pressure according to a target braking force by activating an electric actuator in response to a required boosting request;
• a normally-open solenoid valve which is provided in a hydraulic pressure passage that communicates between the master cylinder device and the motor cylinder device, and operates to open or close the hydraulic pressure passages;
• and
• a controller that performs driving control to close the solenoid valve based on the required boosting request,
• the vehicle braking system further comprising:
• a determination unit that determines whether or not a braking load upon a boosting request is in a steady range, wherein
• when the braking load upon the boosting request exceeds a predetermined first load threshold, the determination unit determines that the braking load is in a caution range above the steady range,
• when the braking load upon the boosting request is in the caution range, the controller executes braking control using a first valve closing transient characteristic to close the solenoid valve from the point of occurrence of the boosting request, and
• the first valve closing transient characteristic is set steeper than a second valve closing transient characteristic to close the solenoid valve from the point of occurrence of the boosting request when the braking load upon the boosting request is in the steady range.