Patent ID: 6434933
Filing Date: 2002-08-20
Classification: B60T

Abstract:
A hydraulic pressure brake having a vacuum boosting device and a hydraulic boosting device, comprising:a master brake cylinder that includes a master cylinder piston and a pressure chamber for outputting hydraulic brake pressure in response to a brake pedal operation; the vacuum boosting device for vacuum boosting operation of the master cylinder piston by vacuum pressure in response to the brake pedal operation; pump means for outputting a hydraulic brake pressure independently of the master brake cylinder; the hydraulic boosting device for hydraulic boosting operation of the master cylinder piston by the hydraulic pressure output from the pump means in response to the brake pedal operation; valve means for prohibiting the hydraulic boosting operation by the hydraulic boosting operation device during the vacuum boosting when the vacuum pressure is within a boosting limit of the vacuum boosting device and for allowing the hydraulic boosting operation by the hydraulic boosting device when the vacuum pressure by the vacuum boosting device reaches the boosting limit of the vacuum boosting device; and detecting means for detecting a condition of at least one of the vacuum boosting device and the brake pedal operation, with the pump means being driven based on an output signal from the detecting means.