A piston manufacturing device includes a first forming device (42) configured to form an annular groove (61) in a piston (11), and a second forming device (52) configured to press an edge (15) of an opening (14) of the piston (11) toward other end side in an axial direction of the piston (11) and to form a thick section (65) extruded from an inner circumferential surface (12b) arranged between the edge (15) and the groove (61) toward an axial center side of the piston (11), wherein a recessed section (53) is formed at a portion of the second forming device (52) that is arranged to abut the edge (15) so that an inner circumferential side of the edge (15) is plastically deformed toward the other end side in an axial direction of the piston (11).

A disc brake caliper, has a caliper body having a pair of half-calipers which define a housing compartment for a portion of an associable brake disc. The half-calipers being placed on opposite sides to the housing compartment in an axial direction parallel to the rotation axis of the associable brake disc. At least one half-caliper is fitted with at least one housing seat for a piston suitable to press a pad against the associable brake disc, in the axial direction. The housing seat passes through the respective half-caliper so as to extend between an inner wall facing the housing compartment and an outer wall of the half-caliper, axially opposite the housing compartment. A cup-shaped hollow insert is housed inside the housing seat so as to present a closed end wall, placed on the side of the outer wall of the half-caliper, and a cavity having an aperture facing axially towards the housing compartment. At least one piston is housed inside the cavity of the insert and is guided axially by an inner side wall of the insert.

A guiding system for a brake piston of a motor-vehicle disk brake comprises a brake piston, a cylindrical brake-piston bore for accommodating the brake piston in a housing in such a way that the brake piston can be axially displaced, and a ring seal supported in the housing in an axially immovable manner, which ring seal is elastically clamped between a cylindrical brake-piston wall and a recess in the brake-piston bore. In order to improve the NVH behavior in the avoidance of disturbing noises of motor-vehicle disk brakes, a reversibly elastically preloaded guiding means is clamped between the brake-piston bore and the brake-piston wall, which guiding means is supported on the housing and couples the brake piston to the brake-piston bore in such a way that the brake piston is oriented in a specific manner.

A hydraulic anti-lock brake wheel cylinder includes a cylinder body with a first cavity having an end cover, a first oil chamber interface, a second oil chamber interface and an oil return interface. A first piston is arranged within the first cavity, a first spring between the first piston and the end cover, a first oil chamber between the first piston and a bottom of the first cavity, the first oil chamber communicating with the first oil chamber interface; the first piston having a second cavity, a second piston arranged within the second cavity; a second spring between the second piston and a bottom of the second cavity, a second oil chamber between the second piston and a top of the second cavity; a core tube within the cylinder body, and one end of the core tube communicating with the second oil chamber, the other end communicating with the second oil chamber interface; the oil return interface communicating with the first oil chamber when the first piston moves outwards to a set position.

According to an aspect of the disclosure, there is provided a brake piston provided in a brake system of a vehicle and pressing a brake pad to a disc by braking hydraulic pressure, the brake piston including: a body portion installed in a cylinder provided in a caliper housing, being in a shape of a pillar, and configured to be movable forward and backward, wherein the body portion includes: a first body portion provided at an outer side of the body portion in a radial direction of the disc; and a second body portion provided at an inner side of the body portion in the radial direction of the disc and having a coefficient of elasticity that is different from a coefficient of elasticity of the first body portion.

Disclosed is a disk brake caliper assembly where a second seal is positioned in a second annular groove to eliminate the seizure of the piston cylinder that commonly occurs on trailer brakes that are immersed in water. The second seal is slightly deformable and designed to frictionally engage the piston. The second seal functions as both a wiper to keep dirt and contaminants out of the cylinder assembly and to prevent water ingress. The use of the secondary seal can compliment or eliminate the need for a dust boot.

A brake includes: a hydraulic cylinder including a brake hole, and the brake hole including a piston assembly configured to move along an axial direction of the brake hole; a limiting support fixed to the hydraulic cylinder and covering the brake hole; a push rod passing through the limiting support, connected to the piston assembly, and configured to drive the piston assembly to move along the axial direction of the brake hole; and an elastic element disposed on the limiting support and opposite to the piston assembly, and configured to abut against the piston assembly for limiting the piston assembly.

Systems are provided for a brake assembly. In one example, a brake assembly includes a braking clamp physically coupled to a spindle via a plurality of fasteners, wherein the braking clamp includes a plurality of openings configured to receive a first plurality of actuators. The spindle includes a first plurality of openings shaped to receive the plurality of fasteners and a second plurality of openings shaped to receive a second plurality of actuators.

Disclosed is an electronic parking brake system includes: an electronic parking brake having an electric motor and a hydraulic cylinder; an ESC actuator configured to generate and supply hydraulic pressure to the hydraulic cylinder; and a controller configured to control the electric motor and the ESC actuator. The controller determines whether or not the electronic parking brake is normally releasable based on the temperature of the electronic parking brake when parking is released, and controls the electric motor to supply hydraulic pressure to the hydraulic cylinder via the ESC actuator and start parking release control when normal release is not possible.