Disclosed herein a caliper brake includes a carrier in which a pair of pad plates are installed to move forward and backward toward a disk; a caliper housing slidably installed on the carrier and provided with a cylinder; a piston installed in the cylinder and configured to move forward and backward toward the pair of pad plates by a braking hydraulic pressure; a seal groove formed to be recessed in an annular shape on an inner surface of the cylinder; and a seal member accommodated in the seal groove, the seal member including a front surface located in a forward direction of the piston; wherein the front surface is provided with a protrusion from which at least a part thereof protrudes.

Disclosed herein a caliper brake includes a carrier in which a pair of pad plates are installed to move forward and backward toward a disk; a caliper housing slidably installed on the carrier and provided with a cylinder; a piston installed in the cylinder and configured to move forward and backward toward the pair of pad plates by a braking hydraulic pressure; a seal groove formed to be recessed in an annular shape on an inner surface of the cylinder; and a seal member accommodated in the seal groove, the seal member including a front surface located in a forward direction of the piston; wherein the front surface is provided with a protrusion from which at least a part thereof protrudes.

This disc brake includes a mounting member, a pair of brake pads, a caliper, a cover member, and a locking member. The caliper includes a cylinder part having a cylinder hole in which a piston for moving one of the pair of brake pads is disposed, a bridge part extending across an outer circumferential surface of a disc from the cylinder part, a plurality of claw parts formed on an extended distal end side of the bridge part and disposed to face the cylinder part, and a recessed part provided between the plurality of claw parts, having an opening at a disc radial direction inner end, and formed to face the cylinder hole. The locking member includes a fixing part fixed to the cover member, and a plurality of locking pieces extending from the fixing part in a direction inclined with respect to a movement direction of the piston.

This disc brake includes a mounting member, a pair of brake pads, a caliper, a cover member, and a locking member. The caliper includes a cylinder part having a cylinder hole in which a piston for moving one of the pair of brake pads is disposed, a bridge part extending across an outer circumferential surface of a disc from the cylinder part, a plurality of claw parts formed on an extended distal end side of the bridge part and disposed to face the cylinder part, and a recessed part provided between the plurality of claw parts, having an opening at a disc radial direction inner end, and formed to face the cylinder hole. The locking member includes a fixing part fixed to the cover member, and a plurality of locking pieces extending from the fixing part in a direction inclined with respect to a movement direction of the piston.

During an operation of applying a parking brake, when sufficient brake clamping force is applied by a brake actuator, a parking lock actuator having a pin is energized to cause the pin to be moved toward a strut so that the strut is engaged with one of notches of a rotatable part operably connected with the brake actuator in order to prevent rotation of the rotatable part in one direction of releasing the brake and to allow rotation of the rotatable part in the other direction of applying the brake, and then the parking lock actuator is de-energized and the pin is moved away from the strut. During an operation of releasing the parking brake, the brake actuator rotates the rotatable part in the brake apply direction to disengage the strut from the notch, and then releases the brake.

During an operation of applying a parking brake, when sufficient brake clamping force is applied by a brake actuator, a parking lock actuator having a pin is energized to cause the pin to be moved toward a strut so that the strut is engaged with one of notches of a rotatable part operably connected with the brake actuator in order to prevent rotation of the rotatable part in one direction of releasing the brake and to allow rotation of the rotatable part in the other direction of applying the brake, and then the parking lock actuator is de-energized and the pin is moved away from the strut. During an operation of releasing the parking brake, the brake actuator rotates the rotatable part in the brake apply direction to disengage the strut from the notch, and then releases the brake.

A parking brake for a wheel rotor having a brake pad associated therewith includes a housing defining first and second passages. First and second pistons are provided in the respective first and second passages. Spindles are threadably connected with each piston. A clutch unit is connected to the spindles. The clutch unit has a first condition allowing relative rotation between the spindles and the pistons such that the pistons are axially movable within the passages and into engagement with the brake pad in response to hydraulic pressure applied to the pistons. The clutch unit has a second condition preventing relative rotation between the spindles and the pistons such that pistons remains engaged with the brake pad when hydraulic fluid pressure is removed from the pistons.

A method for controlling vehicle braking of a wheel rotor having a brake pad associated therewith includes moving a piston into engagement with the brake pad by applying hydraulic pressure to the piston. The piston is locked in place against the brake pad with a parking brake. The hydraulic pressure is removed from the piston while the parking brake is locked.

A brake apparatus for a vehicle includes a screw bar positioned inside a caliper body, and rotated by receiving power of a driving motor; a nut unit including a nut which surrounds the screw bar, and a nut holder which is threadedly coupled with the screw bar, is movable on the nut and is moved toward a pad member by rotation of the screw bar; and a piston unit surrounding the nut unit, and pressing the pad member, wherein the nut holder is brought into contact with the piston unit while being moved toward the pad member, and moves the nut such that the nut pushes the piston unit.

A pad clip in which a circumferential dimension from a first contact portion in contact with a side surface of a coupling portion, which is disposed on the other side in the circumferential direction, on the one side in the circumferential direction in a fixing portion disposed on the other side to a side surface of a sandwiched plate portion on the one side is available to be set independently of a circumferential dimension from a first contact portion to a second contact portion in contact with the side surface of the coupling portion, which is disposed on the one side, on the other side in the fixing portion disposed on the one side. The side surface of the sandwiched plate portion is in surface contact with a torque-receiving surface regardless of bending deformation generated in a main body portion based on elastic deformation of a pressing portion.