Patent ID: 8430213

Claim:
An electric brake apparatus comprising: a disc rotor rotating together with a wheel; an actuator for rectilinearly actuating a piston in an axial direction of the disc rotor by using an electric motor; a drive controller for performing drive control of the actuator; a brake pad to be pressed by the piston to give frictional resistance to the disc rotor in a rotational direction; and a braking start position detecting means for detecting a braking start position of the piston at which position the brake pad is brought into contact with the disc rotor, wherein the drive controller stores the braking start position detected by the braking start position detecting means as a maximum braking start position, and updates a stored value of the maximum braking start position when the braking start position shifts in a pressing force increasing direction, the drive controller updates the braking start position detected by the braking start position detecting means as a current braking start position at intervals shorter than those of the maximum braking start position, and calculates the thermal expansion amount of the brake pad, and the drive controller changes the thrust of the piston or the position of the piston based on the difference between the maximum braking start position and the current braking start position, and the difference between the maximum braking start position and the initial braking start position.