A piston assembly for a disc brake assembly having a housing with a passage includes a piston provided in the passage and axially movable therein in response to hydraulic pressure. A rotatable spindle extends into the piston. A nut is threadably connected to the spindle such that rotation of the spindle results in axial movement of the nut within the passage to thereby axially move the piston. A damping member encircles the nut and has one of a sliding and rolling interface with the piston in response to relative axial movement between the nut and the piston to prevent rattling of the nut against the piston.

A piston assembly for a disc brake assembly having a housing with a passage includes a piston provided in the passage and axially movable therein in response to hydraulic pressure. A rotatable spindle extends into the piston. A nut is threadably connected to the spindle such that rotation of the spindle results in axial movement of the nut within the passage to thereby axially move the piston. A damping member encircles the nut and has one of a sliding and rolling interface with the piston in response to relative axial movement between the nut and the piston to prevent rattling of the nut against the piston.

A method of servicing a brake system, comprising: (a) moving an actuator of the brake system from a first position to a second position; (b) conducting a manual operation on the brake system when or after the actuator reaches the second position; and (c) after completing the manual operation, moving the actuator to a third position.

A method of servicing a brake system, comprising: (a) moving an actuator of the brake system from a first position to a second position; (b) conducting a manual operation on the brake system when or after the actuator reaches the second position; and (c) after completing the manual operation, moving the actuator to a third position.

A method for influencing the kinematic behavior of a vehicle, in particular a rail vehicle with at least one friction brake system, wherein a brake effect is generated by pressing at least one first and second friction elements against each other, where to achieve advantageous method conditions, temperatures of at least the first friction element are calculated from at least speed, brake pressure, external temperature of the vehicle and absolute times, and heat conduction through the first friction element and a speed-dependent cooling process of the first friction element are taken into consideration during the calculation, and where the kinematic behavior of the vehicle is influenced based on the calculation such that expensive fitting of the friction brake system with sensors for measuring friction element temperatures can be advantageously omitted, and the thermal state of the friction brake system can still be estimated with a high degree of precision.

It is possible to prevent occurrence of a resonance phenomenon of a hydraulic unit and to improve attachability/detachability of the hydraulic unit to/from a bracket. A support section (42, 43) includes: a fixture member (80) that is fixed to a housing (30) for a hydraulic unit (10); and a vibration absorbing member (75) that is interposed between the housing (30) and a bracket (41) and has a through-hole (75a) through which the fixture member (80) passes. The vibration absorbing member (75) includes two vibration absorbing members (75B, 75C, 75D) having different rebound resilience from each other. In a state where the vibration absorbing member (75) is partially accommodated in a recessed section (47) of the bracket (41), the vibration absorbing member (75) is held between the housing (30) and the bracket (41).

It is possible to prevent occurrence of a resonance phenomenon of a hydraulic unit and to improve attachability/detachability of the hydraulic unit to/from a bracket. A support section (42, 43) includes: a fixture member (80) that is fixed to a housing (30) for a hydraulic unit (10); and a vibration absorbing member (75) that is interposed between the housing (30) and a bracket (41) and has a through-hole (75a) through which the fixture member (80) passes. The vibration absorbing member (75) includes two vibration absorbing members (75B, 75C, 75D) having different rebound resilience from each other. In a state where the vibration absorbing member (75) is partially accommodated in a recessed section (47) of the bracket (41), the vibration absorbing member (75) is held between the housing (30) and the bracket (41).

A disk brake includes a brake mechanism configured to apply a braking force by advancing a piston in a cylinder portion based on driving of an electric motor to thus press inner and outer brake pads against a disk rotor, and an elastic member configured to bias the inner and outer brake pads in an axial direction of the disk rotor and in a direction away from the disk rotor. A biasing force of the elastic member is greater than sliding resistance of the piston on the cylinder portion. Due to this configuration, the disk brake can effectively prevent or reduce the drags of the inner and outer brake pads.

A disk brake includes a brake mechanism configured to apply a braking force by advancing a piston in a cylinder portion based on driving of an electric motor to thus press inner and outer brake pads against a disk rotor, and an elastic member configured to bias the inner and outer brake pads in an axial direction of the disk rotor and in a direction away from the disk rotor. A biasing force of the elastic member is greater than sliding resistance of the piston on the cylinder portion. Due to this configuration, the disk brake can effectively prevent or reduce the drags of the inner and outer brake pads.

Provided fire an electric parking brake device and an electric parking brake control method that can apply an appropriate clamping force by accelerating data measurement and by suppressing influence of load fluctuation during idle rum For this end, the electric parking brake device of the present invention includes: a disc rotor; brake pads that are pressed to the disc rotor; an electric motor that imparts a thrust to the brake pads; a current detection unit that detects a motor current of the electric motor; and a brake control device that controls the electric motor 8 based on the motor current. The brake control device controls the electric motor 8 based on a current change amount of an electric current during a period from a point of time that the motor current becomes a peak current to a predetermined point of time.