A load-adjuster for a car has a pinion (13) driven by a servomotor and held on a pivoted lever against the force of a spring. The pinion engages a gear (16) that is part of the adjustment drive. The servomotor can rotate in both directions and the teeth of the pinion and the gear are asymmetrical so as to give a shallow meshing angle and in both rotation directions, no thrust forces appear on the teeth such as would cause the lever (15) to tilt into the disengagement position. Because of the asymmetry of the teeth, the resulting force on the lever caused by tooth contact is directed along the lever axis, or possibly slightly displaced on the side of the solenoid (7).
