Disc brake apparatus

A disc brake apparatus comprising:

• a pair of pads disposed on opposite sides of a disc;
• a caliper for moving forward a piston slidably disposed in a cylinder having a closed end, using a hydraulic pressure supplied by operation of a brake pedal, thereby pressing the pair of pads against the disc to exert a brake force;
• a parking brake mechanism operated by an electric actuator as a drive source to mechanically hold the piston, which has been moved forward by the hydraulic pressure supplied from a hydraulic circuit into the caliper, in a braking position even after the hydraulic pressure is released;
• and
• a controller for activating the hydraulic circuit, based on a parking-brake indicating signal, to supply a predetermined hydraulic pressure into the caliper, and for operating the parking brake mechanism to hold the piston in the braking position,
• wherein, when the hydraulic pressure in the caliper exceeds the predetermined pressure and the parking-brake indicating signal is input to the controller to initiate a parking brake operation to hold the piston in the braking position, the controller does not operate the parking brake mechanism to hold the piston in the braking position by the parking brake mechanism.