Patent ID: 6389812
Filing Date: 2002-05-21
Classification: B60T

Abstract:
A hydraulic pressure brake apparatus comprising:a master cylinder that includes a master cylinder piston advanced in accordance with depression of a brake pedal to increase a brake fluid pressure from a reservoir and output a hydraulic brake pressure; negative pressure assistance means for assisting advancement of the master cylinder piston by negative pressure in accordance with the depression of the brake pedal; a pump for increasing the brake fluid pressure of the reservoir independently from the master cylinder to output the hydraulic brake pressure; hydraulic pressure assistance means having a power chamber formed rearward of the master cylinder piston for supplying the hydraulic pressure output from the pump to the power chamber to assist the master cylinder piston; valve means controlling an assistance force of the master cylinder piston by the hydraulic pressure assistance means; a single reaction force member provided between the master cylinder piston and the hydraulic pressure assistance means to transmit a reaction force to the brake pedal.