Patent ID: 8366207

Claim:
A brake hydraulic pressure control apparatus comprising: a reservoir storing a brake fluid at an inner portion connected to atmospheric air; a brake hydraulic pressure supply device connected to the reservoir and pressurizing the brake fluid that is supplied by the reservoir in response to an operation of a brake pedal; a hydraulic pump suctioning the brake fluid within the reservoir and discharging the brake fluid having a predetermined brake hydraulic pressure; a plurality of wheel cylinders provided at a plurality of wheels of a vehicle respectively and connected to the brake hydraulic pressure supply device, each of the plurality of wheel cylinders generating a braking force at each of the wheels by receiving the brake hydraulic pressure from the hydraulic pump; a cut valve provided between the brake hydraulic pressure supply device and the plurality of wheel cylinders and disconnecting the brake hydraulic pressure supply device from the plurality of wheel cylinders; a plurality of pressure-increasing solenoid valves provided between the hydraulic pump and the respective wheel cylinders, the plurality of pressure-increasing solenoid valves connecting and disconnecting the hydraulic pump relative to the respective wheel cylinders by opening and closing; a plurality of pressure-decreasing solenoid valves connected to the respective wheel cylinders and opening and closing, the pressure-decreasing solenoid valves being formed by linear solenoid valves respectively; a discharge passage including a plurality of relief passages of which first ends are connected to downstream sides of the pressure-decreasing solenoid valves respectively and a circulating passage connecting second ends of the plurality of relief passages to the reservoir; a controlling device controlling the brake fluid within the wheel cylinders to be a predetermined value in response to an operating level of the brake hydraulic pressure supply device in a case where the brake hydraulic pressure supply device is operated, the controlling device bringing the brake hydraulic pressure to be applied to the wheel cylinders from the hydraulic pump by disconnecting the brake hydraulic pressure supply device from the wheel cylinders by the cut valve while the pressure-increasing solenoid valves are each in an open state, and bringing the brake fluid within the wheel cylinders to be circulated to the reservoir via the discharge passage by operating the pressure-decreasing solenoid valves; and a pulsation transmission decreasing device provided at the discharge passage and decreasing a transmission of a pressure pulsation generated by at least one of the pressure-decreasing solenoid valves.