Abstract: A level control system for motor vehicles having pneumatic springs which function in accordance with the vehicle load. A specified distance is normally maintained between the vehicle body the vehicle axle. This distance is maintained by charging or discharging the pneumatic springs. The level control system includes an air dryer and a pneumatic relay type of controllable discharge valve having a relatively large cross-sectional port by which the air dryer is connected to the atmosphere. The discharge valve operates against a spring return force. The magnitude of the spring return force corresponds to a preselected minimum pneumatic spring pressure. The system counteracts an icing action of the discharge valve and prevents an unintentional and complete discharging of the pneumatic springs.

Abstract: An automatic adjustment apparatus for the brake lever of a vehicle brake with a worm drive, an adjustment mechanism and a one-way coupling. The automatic adjustment of the brake lever on the brake shaft takes place by means of a one-way coupling. When there is a manual adjustment of the brake lever in the direction of the release of the brake jaws, the one-way coupling can be mechanically disengaged.