Patent ID: 8776958

Claim:
A brake apparatus for restraining rotation of a wheel of a vehicle by application of a brake that is to be activated for causing a friction member held by a non-rotatable body, to be pressed against a brake rotor that is to be rotated together with the wheel, through a piston that is movable in an axial direction of said piston, said brake apparatus comprising: a power drive device; another drive device in addition to said power drive device; a driven member that is to be moved, by said power drive device, relative to said piston in said axial direction; an engaging portion that is provided in one of said driven member and said piston, such that said piston is held in engagement with said driven member through said engaging portion; an engaged portion which is provided in the other of said driven member and said piston and which is to be engaged with said engaging portion, wherein said piston is activated by a driving force of said another drive device, wherein said engaging portion is disposed such that, during release of the application of said brake, said piston is movable rearwardly while being held in engagement with said driven member through said engaging portion, and wherein said engaged portion is spaced apart from said engaging portion by a clearance in said axial direction, when said driven member and said piston are brought into contact in said axial direction.