Abstract: A disc brake apparatus which can securely suppress clunking sounds not only at the time of forward braking of a vehicle but also at the time of back braking of the vehicle is provided. When a backing metal 6A of a brake pad 6 shifts toward a first torque receiving part 3C of a torque member 3 along with an operation for forward braking of the vehicle, a leading end part of a spring piece 9A engages one slope of an engaging projection 6E, so as to elastically press the backing metal 6A toward the first torque receiving part 3C, whereby the disc brake apparatus is held in a first contact state. When the backing metal 6A shifts toward a second torque receiving part 3D of the torque member 3 along with an operation for back braking of the vehicle, the leading end part of the spring piece 9A engages the other slope of the engaging projection 6E, so as to elastically press the backing metal 6A toward the second torque receiving part 3D, whereby the disc brake apparatus is held in a second contact state.

Abstract: A brake apparatus has a good brake operation feel provided by a combination of a link mechanism and a brake booster. The link mechanism changes a lever ratio so that the lever ratio is gradually decreased as a pedal stroke is increased after the pedal stroke reaches a predetermined point. The brake booster increases a rate of increase of an output force so that the rate of increase is increased as an input force is increased. A brake characteristic of the brake apparatus as a whole exhibits a linear relationship relative to the deceleration of the vehicle, the brake characteristic being defined as an inclination of the deceleration against the pressing force input to the link mechanism. One of the link mechanism and the brake booster may be used alone in a brake apparatus to provide their respective effect to a brake apparatus.

Abstract: A brake apparatus has a good brake operation feel provided by a combination of a link mechanism and a brake booster. The link mechanism changes a lever ratio so that the lever ratio is gradually decreased as a pedal stroke is increased after the pedal stroke reaches a predetermined point. The brake booster increases a rate of increase of an output force so that the rate of increase is increased as an input force is increased. A brake characteristic of the brake apparatus as a whole exhibits a linear relationship relative to the deceleration of the vehicle, the brake characteristic being defined as an inclination of the deceleration against the pressing force input to the link mechanism. One of the link mechanism and the brake booster may be used alone in a brake apparatus to provide their respective effect to a brake apparatus.