Patent attributes
A hydraulic brake apparatus for use in a vehicle having wheels and a brake operating member manually operable by a driver, the apparatus including a manual pressure source including (a) a hydraulic booster which boosts an operating source applied by the driver to the brake operating member and produces a first hydraulic pressure corresponding to the boosted operating force, and (b) a master cylinder which produces a second hydraulic pressure corresponding to the boosted operating force as an output of the hydraulic booster; a power pressure source which produces, by utilizing a power, a third hydraulic pressure irrespective of whether the brake operating member is operated; hydraulic brakes which are provided in association with the wheels, respectively, and include respective brake cylinders, and each of which, upon supplying of a hydraulic pressure to a corresponding one of the brake cylinders, applies a hydraulic braking force to a corresponding one of the wheels; a hub portion which is connected to each of the brake cylinders and to which the hydraulic booster, the master cylinder, and the power pressure source are connected in parallel; and a pressure source communication control device which selectively allows at least one of the hydraulic booster, the master cylinder, and the power pressure source to communicate with the hub portion.
