A disk brake with lower cost and improved maintainability is provided. The brake caliper includes at least one actuating device for actuating the disc brake using a moveably guided bridge. The bridge has at least one threaded hole into which an actuating spindle is displaceably located. A brake disk end of the actuating spindle penetrates a caliper closing plate facing the brake disk. The positioning spindle carries a rotatably-mounted pressure piece which presses a brake pad against the brake disc. The opening is sealed by a bellows retained on the brake caliper on one side and on the pressure piece on the other side. A securing ring non-rotatably located on the actuating spindle and rotatably connected to the thrust piece interacts with the bellows during brake application and/or release to maintain a desired air gap between the brake disk and brake pad.

An operating unit for a parking brake of motor vehicles including an operatively connected unit having of a drive spindle and nut, which forms an axially longitudinally adjustable element of a linear drive. The drive spindle has a drive side for connection to an electric drive and a substantially cylindrical spindle portion having an external thread. The nut has a sleeve-shaped central body having an internal thread and a head portion designed to act as a pressure piston on a brake element of the parking brake. The internal and external threads intermesh in the operative connection and define a common axial axis of rotation. The thread is a symmetrical thread, and the flank angles, relative to a radial reference plane perpendicular to the axis of rotation, have angle values which are substantially equal in magnitude.

A parking brake for a wheel rotor having a brake pad associated therewith includes a housing defining first and second passages. First and second pistons are provided in the respective first and second passages. Spindles are threadably connected with each piston. A clutch unit is connected to the spindles. The clutch unit has a first condition allowing relative rotation between the spindles and the pistons such that the pistons are axially movable within the passages and into engagement with the brake pad in response to hydraulic pressure applied to the pistons. The clutch unit has a second condition preventing relative rotation between the spindles and the pistons such that pistons remains engaged with the brake pad when hydraulic fluid pressure is removed from the pistons.

A brake apparatus for a vehicle includes a screw bar positioned inside a caliper body, and rotated by receiving power of a driving motor; a nut unit including a nut which surrounds the screw bar, and a nut holder which is threadedly coupled with the screw bar, is movable on the nut and is moved toward a pad member by rotation of the screw bar; and a piston unit surrounding the nut unit, and pressing the pad member, wherein the nut holder is brought into contact with the piston unit while being moved toward the pad member, and moves the nut such that the nut pushes the piston unit.

Brake apparatus for a motor vehicle with a restoring apparatus, comprising a brake support body, a brake lining, a restoring apparatus for the brake lining, and a wear compensation means, the restoring apparatus being connected via the wear compensation means to the brake lining, the restoring apparatus having a lever arm which comprises a spring section, a supporting bearing and a lever bearing, the lever bearing being arranged between the spring section and the supporting bearing.

An electromagnetic brake device presses a pressing plate against a brake rotor along an axis via a friction material by the electromagnetic force of an electromagnetic actuator. The electromagnetic brake device includes a support member that is disposed on the opposite side of the pressing plate to the brake rotor and that is supported by a housing so as to be displaceable along the axis and non-rotatable around the axis, and a shaft member that transmits a force in the direction along the axis between the pressing plate and the support member. An electromagnetic coil and an armature of the electromagnetic actuator are spaced apart from the pressing plate between the pressing plate and the support member, the electromagnetic coil is supported by the housing, and the armature is supported by the support member.

A device for adjusting clearance of a drum brake has an extendable strut assembly having a toothed ring and arranged between first and second shoes cooperating with a braking surface of a drum and moved by an actuating device from a resting position, in which they are distanced from the braking surface, to a braking position, in which they abut against the braking surface. The device has a first lever assembly, a second lever assembly having a coupling portion, and a connecting member having a connecting seat. The coupling portion is coupled to the connecting seat with a predetermined functional clearance. When the first and second shoes move from the resting position, the coupling portion slides in the connecting seat with an idle stroke equal to the predetermined functional clearance without transmitting motion to the connecting member and the first lever assembly. The second lever assembly transmits motion to the connecting member after the coupling portion has covered the idle stroke.

A parking brake apparatus may include: a driving part; a driving gear rotatably connected to the driving part; a gear shaft engaged with the driving gear so as to be rotated by the driving gear; a pair of pistons disposed on both sides of the gear shaft and connected to brake shoes, respectively; a pair of nuts disposed in the respective pistons, and screwed to the gear shaft; an elastic member installed between the piston and the nut so as to pressure the nut toward the brake shoe; a holder installed in the piston so as to support the elastic member; and a constraint ring installed in the piston so as to constrain the holder.

A spreader unit for a drum brake is provided with a readjustment device which ensures that the clearance remains substantially constant even in the case of wear on the brake linings. The readjustment device is arranged between actuating pistons and changes the spacing of the actuating pistons in at least one readjustment step when an actuating travel of the first and second brake shoe holders has exceeded a travel setpoint value. A thermally actuable blocking device mechanically prevents the execution of the readjustment step by the readjustment device at a temperature above a temperature setpoint value

A disc brake (1) for a utility vehicle includes a brake disc (19), a brake caliper (2) which surrounds the brake disc (19), an application-side brake lining (3), a rim-side brake lining (3a) and an application-side application device (4) which is arranged in the brake caliper (2). The application device (4) has at least one adjustment spindle (5) and a pressure plate (6) that is arranged axially between the adjustment spindle (5) and the application-side brake lining (3). A plain bearing element (7) is arranged between the pressure plate (6) and the adjustment spindle (4).