A cycle braking system is provided where the system comprises a brake sphere engaged with a shaft adjacent to a wheel of a cycle and a brake caliper, where the brake caliper is mounted to a cycle's chassis and aligned around the brake sphere rotor. In one embodiment, the cycle braking system further comprises brake pad(s) with an inner side and a contact side, a brake housing having the brake pad(s) positioned between the caliper and the contact side facing the brake sphere; and the brake caliper connected to a cycle's hydraulic lines.

An electronic parking brake device including: a plate part having a brake shoe rotatably mounted thereon; a housing part mounted on the plate part and configured to guide hydraulic pressure; a motor part mounted on the housing part, and driven when power is applied thereto; a piston part mounted on the housing part, and moved by hydraulic pressure so as to operate the brake shoe; and an operation part embedded in the housing part, disposed between the piston parts, and driven by the motor part so as to push the piston parts.

A wet-running multi-disk clutch (B) for a motor vehicle transmission (G) includes a piston (K) provided at a first side of the multi-disk clutch (B), by which a force acting in an axial direction is applicable onto inner and outer clutch disks (IL, AL) in order to engage the multi-disk clutch (B). The multi-disk clutch (B) is supported against an abutting surface (AF) via an end disk (ALE) of the outer clutch disks (AL) at a second side, which is opposite the first side. Grooves (N) are provided at one or both of the abutting surface (AF) and the end disk (ALE). The grooves (N) are configured and arranged such that cooling fluid (O) routed to the multi-disk clutch (B) is flowable out of the multi-disk clutch (B) through the grooves (N).

An electronic parking brake device may include: a plate part having a brake shoe rotatably mounted thereon; a housing part mounted on the plate part and configured to guide hydraulic pressure; a motor part mounted on the housing part, and driven when power is applied thereto; a piston part mounted on the housing part, and moved by hydraulic pressure so as to operate the brake shoe; and an operating part embedded in the housing part, and driven by the motor part so as to move the piston part.

A system comprises a slave cylinder for a motorcycle. The slave cylinder may include a rod with a height which is hydraulically adjustable by a hydraulic pressure adjuster. A motorcycle slave cylinder is also provided which includes a rod having a height. The motorcycle slave cylinder also includes a hydraulic pressure adjuster. The hydraulic pressure adjuster hydraulically adjusts the height of the rod above the motorcycle slave cylinder.

The present invention addresses the problem of providing a disc brake device for which sliding at the boundary surface between a piston and a piston seal is suppressed, and dragging is reduced. The present invention is provided with a cylinder, a piston housed in the cylinder, an inner brake pad opposing a disc rotor, an inner circumferential groove formed in a cylinder inner circumference, and a piston seal that is provided in the inner circumferential groove and contacts the piston. The inner circumferential groove is provided with a wall, a wall on the opposite side from the wall, a bottom wall connecting the wall and the wall, and a curved surface expanding the inner circumferential groove at the wall. The bottom wall is formed such that the distance to the piston gradually increases from the wall toward the wall. The curved surface is provided with a curvature starting point on the side closer to the piston seal and a curvature endpoint on the opposite side from the curvature starting point with the curved surface therebetween, and the curvature endpoint is positioned farther outside than the cylinder inner circumference.

A hydraulic brake system includes: a plurality of hydraulic brakes respectively provided for a plurality of wheels of a vehicle, each of which is configured to reduce rotation of a corresponding one of the wheels by a hydraulic pressure in a hydraulic-pressure chamber of a wheel cylinder; and a plurality of electric cylinder devices each of which is provided for one or more of the plurality of hydraulic brakes. Each electric cylinder device includes: a housing; a piston fluid-tightly and slidably disposed in the housing; an electric motor as a drive source; a rotation-linear motion converting mechanism configured to convert a rotational motion of the electric motor to a linear motion of the piston; and a volume change chamber disposed forward of the piston and connected to the hydraulic-pressure chamber of the wheel cylinder of each of the one or more of the plurality of hydraulic brakes.

Provided is an electric parking brake device which enables a service brake that generates a brake force in accordance with an operation input of a vehicle user and a parking brake that generates a brake force with the function of an electric actuator having operation controlled by a control unit to be obtained. The control unit (C) starts to count in response to an end of detection of the service brake by service brake detection means (66) and stops operation of the control unit (C) after an elapse of a first predetermined time from the start of the count. With this configuration, the load on a battery can be reduced by preventing the control unit from being kept activated for a period of time that is longer than necessary.

A slack adjuster and systems, components, and methods can comprise a base enclosure, a pair of floating piston assemblies, and a pair of sensing piston assemblies. The base enclosure can define an internal chamber that extends along a longitudinal axis of the base enclosure and an inlet channel that extends along a transverse axis of the base enclosure perpendicular to the longitudinal axis. The internal chamber can have a first chamber portion, a second chamber portion, and a center chamber portion that intersects the inlet channel. The floating piston assemblies can be respectively provided in the first and second chamber portions. Likewise, the sensing piston assemblies can be respectively provided in association with the floating piston assemblies.

Methods and corresponding control devices for releasing an electric actuator in a reliable manner, such as an electric parking brake in particular, in a motor vehicle brake system. The aim of the invention is to provide an improved function and architecture which helps prevent the disadvantages of open-loop control systems when using a rationalized sensor system, thereby obviating closed-loop control systems. This is achieved by a release method and a corresponding electronic control unit which obtains an especially modulated change in the power requirement during the release process upon impacting the quasi-elastic release end stop of the electric actuating unit such that the change is fed back, the change being detected in order to be used as information for a power interruption or a termination of the power supply to the electric actuating unit.