the operating bushing 20 provided with the spring loaded crown gear coupling 24 jumps with respect to the now stationary operating ring 21 by a rotational excursion which is determined by an addition of the deformation of the brake parts under further stressing and the amount of lining wear during the braking process when the brake is released the brake application mechanism 6 is de actuated by the compression spring 15 and the brake shaft 8 rotates back in the return direction of the swinging excursion of the brake lever 7 this back rotation carries along the pressed in bushing type freewheeling clutch in reverse rotation because of the frictional torque of the cap springs 37 the profiled shafts 31 32 the angle drives and the operating shaft 25 remain unmoved however the springloaded corona gear coupling 24 is back rotated with the brake shaft 8 in the released freewheeling direction of the bushing type freewheeling clutch 18 on account of the friction of the helical spring 22 abutting against the brake shaft 8 whereby such back rotation of coupling 24 continues until the operating ring 21 again rests against the profile of the now unmoving operating shaft 25 after having reestablished the engagement play s after that the force of the cap springs 36.