A brake pad wear measuring system for measuring brake pad wear for a vehicle disc brake system includes a first coil having a first coil face and is excitable to create a first magnetic field. A first target is spaced a fixed distance from the first coil face. The first coil and the first target are configured for movement relative to each other in response to application of the disc brake system so that the first target covers a portion of the first coil that varies with the amount of brake pad wear and varies the inductance of the first coil. The inductance of the first coil is indicative of the amount of brake pad wear. The brake pad wear measuring system also includes a second coil having a second coil face and is excitable to create a second magnetic field. A second target is configured to move toward the second coil face in response to application of the disc brake system so that the distance between the second target and the second coil face varies with the amount of brake pad wear and varies the inductance of the second coil. The inductance of the second coil is indicative of the amount of brake pad wear.

A brake wear sensor is disclosed. In various embodiments, the brake wear sensor includes a bias member configured for connection between a stationary portion of a brake mechanism and a heat sink; and a load cell configured to measure a load in the bias member representative of a length of the heat sink.

The present disclosure provides an electromechanical brake actuator system comprising an electromechanical brake actuator coupled to a derived position sensor, the derived position sensor comprising a controller, a rotation sensor, and an output drive circuit. In various embodiments, the derived position sensor may be configured to receive a first motor shaft angular velocity at a first time, receive a second motor shaft angular velocity at a second time, calculate a linear translation distance, and sum the linear translation distance and a previous ram position to obtain an actual ram position.

The present disclosure provides an electromechanical brake actuator system comprising an electromechanical brake actuator coupled to a derived position sensor, the derived position sensor comprising a controller, a rotation sensor, and an output drive circuit. In various embodiments, the derived position sensor may be configured to receive a first motor shaft angular velocity at a first time, receive a second motor shaft angular velocity at a second time, calculate a linear translation distance, and sum the linear translation distance and a previous ram position to obtain an actual ram position.

A brake assembly having a non-braking configuration and a braking configuration includes a brake shoe having a brake lining coupled thereto. An actuator is coupled to the brake shoe, the actuator movable along an actuation path between a neutral actuator position and a braking actuator position. An actuator distance between the neutral actuator position and the braking actuator position increases over time in response to a reduction in thickness of a brake lining installed on the brake shoe. Moving the actuator from the neutral actuator position to the braking actuator position past a predetermined actuation distance causes a ratchet mechanism to advance to a next sequential ratchet position, which in turn moves the neutral actuator position of the actuator a predetermined distance away from the minimum actuator position. A sensor is coupled to the ratchet mechanism for detecting the sequential ratchet position of the ratchet mechanism.

A tread brake assembly for a rail car includes at least one brake block for pressing against a tread of a corresponding rail car wheel, a piston actuator powered by a fluid for driving the tread brake assembly, a brake rigging for transferring a braking stroke from the actuator piston to the at least one brake block, at least one sensor device for measuring at least one parameter of the tread brake assembly, and the tread brake assembly further includes a stroke detector having an active state in which the stroke detector activates the sensor device, wherein the stroke detector is configured to enter its active state upon detecting a force, stress, strain or motion of the brake block, the brake rigging and/or the actuator.

A brake assembly for a rail car includes at least one brake element for pressing against a rotor of a rail car wheel in case of a braking action; an actuator for driving the brake element, a linkage for transferring a braking force from the actuator to the brake element, at least one sensor device for measuring at least one parameter of the brake assembly, and the brake assembly further includes a trigger unit configured to enter its active state when a braking action occurs, wherein trigger unit activates the sensor device in the active state.

The disclosure provides a wear warning device including a caliper, two brake pads, an elastic component and a first switch. The caliper has two push parts. The two push parts are respectively disposed at a first wall surface and a second wall surface of the caliper. The brake pads are located between the two push parts. The elastic component includes two arm parts and a connection part located between the arm parts. The arm parts are respectively disposed on the brake pads. The first switch is located between the arm parts. When the brake pads are in a worn-out state and the push parts are moved toward each other to force the brake pads to clamp a brake disk and to force the two arm parts to move toward each other, one of the arm parts activates the first switch to produce a wear warning signal.

An architecture that provides automatic monitoring of brake conditions making use of a wear pin on a brake. The disclosure makes use of the fact that a wear pin is required to be provided on an aircraft brake, by integrating monitoring functions such as displacement sensors and/or temperature sensors, into the pin. This means that the automatic monitoring components are not taking up more space on the brake than is already taken up by the compulsory wear pin.

A brake (200) comprising a braking surface (202); a brake lever (206) arranged to move between a retracted position and an engaged position; a brake lining (210) and at least one non-contact sensor (212). The brake lining is disposed between the braking surface and the brake lever such that when the brake lever is in the engaged position the brake lining is in contact with the braking surface. The at least one non-contact sensor is arranged to output a signal dependent on the distance between the non-contact sensor and the braking surface.