a first screw body is rotatively mounted around a screwing axis , that extends parallel to the axis of the brake disk in a housing axially arranged next to the brake disk in the mounted position . a second screw body is secured against rotation and linked to the first screw body by a readjustment threaded coupling , so that both screw bodies form together a longitudinally adjustable tappet for exercising an actuating force on a brake shoe . a rotary body can be rotated around its own axis of rotation by means of an actuating member in order to axially displace the tappet the axis of rotation is at least approximately parallel to the brake disk . linking gears arranged between the rotary body and the first screw body have a right - angle gear a drive and a coupling device which transmit a limited torque for readjusting said brake shoe .