Brake control device

A brake control device applied to a hydraulic pressure braking force generating device equipped with a wheel cylinder which applies braking force to a vehicle wheel;

• a master cylinder which outputs a master pressure to the wheel cylinder by driving a master piston by a servo pressure inputted to a servo chamber;
• a mechanical pressure adjusting device which outputs the servo pressure to the servo chamber in response to a pilot pressure which has been inputted to a pilot chamber;
• and
• a valve device which outputs a desired hydraulic pressure to the pilot chamber, wherein the brake control device includes:
• a first sensor which is configured to detect a stroke of a brake operating member;
• and
• an electronic control unit which is configured to judge whether or not the stroke of the brake operating member is within a predetermined range which ranges from a first predetermined value to a second predetermined value, wherein the first predetermined value is set to a value at which the servo pressure is started to increase in response to an operation of the brake operating member and the second predetermined value is set to a value larger than a stroke value of swing of the brake operating member caused by a vibration or swaying of the vehicle, to calculate a value regarding a change speed of the stroke within the predetermined range, to generate the preparatory hydraulic pressure in the pilot chamber by controlling the valve device when it is judged that the stroke of the brake operating member is within the predetermined range, to memorize a control mode group including a plurality of control modes for generating the preparatory hydraulic pressure, to select one control mode from the control mode group based on the calculated value regarding the change speed, and to control the valve device in response to the selected control mode thereby to generate the preparatory hydraulic pressure in the pilot chamber.