A multi-disc brake is provided. The brake can include a radial wear pin cartridge for wear indication. The brake can include an integrated water jacket for cooling.

A method and a system for monitoring wear of a braking frictional pad of a motor vehicle, includes stopping the motor vehicle stably on a horizontal or substantially horizontal plane; determining a current fluid level in a brake fluid reservoir; determining a volume difference (ΔV.sub.L) of the brake fluid in the brake fluid reservoir by comparing the determined current fluid level with a predetermined reference fluid level; when a thickness loss of a braking frictional pad equipped for a front vehicle wheel or a rear vehicle wheel is known, determining a thickness loss of a braking frictional pad assigned for the other front vehicle wheel or the other rear vehicle wheel based on the volume difference of the brake fluid in the brake fluid reservoir and a diameter of a brake piston of the respective brake device.

A method and a system for monitoring wear of a braking frictional pad of a motor vehicle, the motor vehicle including a brake device acting on a vehicle wheel, the brake device including a braking frictional pad that is non-rotatable relative to the vehicle wheel and is linearly movable parallel to a rotational axis of the vehicle wheel; a brake piston configured to drive the braking frictional pad; and an electric parking brake or an electric mechanical brake, the electric parking brake or the electric mechanical brake having a drive motor and a piston driving part driven by the drive motor to be linearly movable, the piston driving part being configured to, when the motor vehicle is braking, drive the brake piston to contact the braking frictional pad and in turn drive the braking frictional pad to move.

A brake, which includes a frame part of the brake, an armature part movably supported on the frame part, and attached to the frame part a limit switch, the switching state of which changes when movement is exerted on the limit switch in the operating direction of the limit switch. The brake also includes a measuring pin that is movably supported on the frame part of the brake and that is separate from the armature part, which measuring pin is connected to the limit switch.

There are provided a brake control device and a brake control method capable of estimating a rigidity change due to a temperature change, uneven wear of a brake pad, an inclination of a brake disc, or the like with a low memory load and with high accuracy up to a region with larger thrust than a measurement range. A brake control device controls a braking unit including a friction member pushed on a braking target member, a piston that abuts on the friction member and moves in a linear motion direction by rotation of an electric motor, and a thrust detection unit that detects thrust of the friction member to the braking target member. The brake control device estimates a relation between a piston position being rigidity of the braking unit, and the thrust, based on a first piston range that is a thrust change as a first inclination with respect to the piston position, and a second piston range that is a thrust change as a second inclination different from the first inclination, with respect to the piston position.

A frictional damper for an elevator system includes one or more friction pads configured to move between a first position, and a second position defined by engagement of the one or more friction pads to the guide rail. An actuation unit urges the one or more friction pads into and out of engagement with the guide rail. The actuation unit includes a hydraulic actuator operably connected to the one or more friction pads to urge movement of the one or more friction pads into and out of engagement with the guide rail via hydraulic fluid pressure. The hydraulic actuator includes a hydraulic cylinder containing a volume of hydraulic fluid and a hydraulic piston located in the hydraulic cylinder and operably connected to the one or more friction pads. An electromagnetic actuator selectably urges hydraulic fluid to apply a force to the hydraulic piston, urging the movement of the friction pads.

A first object and a second object are movable in relation to one another. The first object includes a transponder using an integrated circuit having two terminals which may or may not be shorted. The presence or absence of a short circuit between the two terminals is detected. This is accomplished at least partly by the second object depending on the relative positioning of the first and second objects. The transponder transmits, to a module having a contactless reader function, positioning information corresponding to said relative positioning using a contactless communication protocol.

In some examples, a device can be used for measuring a length of a wear indicator on a brake assembly. The device includes a moveable component configured to move based on contact with the wear indicator. The device also includes a sensor configured to detect a displacement of the moveable component. The device further includes processing circuitry configured to determine the length of the wear indicator based on the displacement of the moveable component detected by the sensor.

In some examples, a system includes a magnet configured to move in response to a movement of a wear pin indicator of a brake assembly of a vehicle; and a sensor configured to generate position data corresponding to the magnet, the position data indicating a relative linear position of the wear pin indicator, wherein the position data corresponds to an estimated remaining useful lifespan of the brake assembly. Additionally, the system includes an energy harvesting device configured to generate an electrical signal based on an operation of one or both of the brake assembly and the vehicle, wherein the energy harvesting device is configured to deliver at least a portion of the electrical signal to the sensor.

Methods and apparatus to sense brake pad wear are disclosed. An example apparatus includes at least one memory device and at least one processor to execute instructions to, in response to an anti-lock braking system event, determine a volume of brake fluid in a brake piston chamber based on a flow rate of the brake fluid and a pressure within the brake piston chamber, and determine at least one of a thickness of a brake pad or a wear of the brake pad based on the volume of the brake fluid in the brake piston chamber and a volume of the brake piston chamber.