Abstract: A power-assisted steering method establishes or sets an auxiliary force by taking into account a plurality of variables such as transverse acceleration and vehicle speed characterizing the instantaneous driving conditions. The driving feel with regard to the state of the road surface and the instantaneous driving situation for the vehicle driver are thereby ensured.

Abstract: A control valve is provided to control the rear axle brake pressure in response to vehicle loading and deceleration. This control valve reduces the rear axle brake pressure relative to the system pressure P.sub.S present at the input side of the control valve whenever the system pressure exceeds a threshold value. The control valve is provided with a control piston therein having an additional active surface thereon. This active surface can be subjected to the pressure P.sub.a via a connection to the control valve input pressure. A seat-controlled valve is located within this connection and exerts a closing force to seal off the connection depending on the deceleration of the vehicle.