Patent ID: 8517475

Claim:
A brake apparatus comprising: a master cylinder that forms a driving fluid pressure chamber, which drives at least one master piston as brake fluid is supplied thereto and discharged therefrom; an electrically-operated pressure adjusting part configured to supply the brake fluid into the driving fluid pressure chamber or discharge the brake fluid in the driving fluid pressure chamber, thereby adjusting a driving fluid pressure of the driving fluid pressure chamber; a reaction force generator that forms a reaction force chamber, which is compressed or expanded as a brake operation member is operated, and that is configured to generate a reaction force fluid pressure in the reaction force chamber in accordance with an operating amount of the brake operation member; a brake fluid path, which connects the reaction force chamber to the driving fluid pressure chamber, and a valve device configured to block, at a current-on state, the brake fluid path between the reaction force chamber and the driving fluid pressure chamber to block flowing of the brake fluid, and to communicate, at a current-off state, the reaction force chamber to the driving fluid pressure chamber through the brake fluid path to enable the flowing of the brake fluid, wherein, when the brake apparatus is in a power supply failure state and the brake operation member is operated, the brake fluid in the reaction force chamber is introduced into the driving fluid pressure chamber so that a master cylinder pressure is generated at the master cylinder.