Patent ID: 7828124

Claim:
An electric disk brake for generating a brake force by converting a rotational motion of a motor into a linear motion so as to advance a piston, and for pressing a brake pad against a disk rotor with the piston, the electric disk brake comprising: a parking brake mechanism including a solenoid, a plunger, and a lock mechanism, the parking brake mechanism being operable to hold a generated brake force by causing the solenoid to move the plunger in an actuating direction so as to actuate the lock mechanism; and a control apparatus operable to control the solenoid; wherein the parking brake mechanism includes a play between the plunger and the lock mechanism or in the lock mechanism, the play allowing the plunger to be moved in the actuating direction at least while the lock mechanism is in a locked state; and wherein the control apparatus includes a parking brake mechanism abnormality determining unit operable to determine whether the parking brake mechanism operates normally or abnormally by applying an electric current to the solenoid so as to cause a movement of the plunger within the play while the lock mechanism is in the locked state.