Abstract: The invention relates to an anti-locking wheel control system in which control signals for the variation of the brake pressure are derived from the rotary motion behavior of the vehicle wheels and in which a test circuit is provided, which initiates a test for at least one wheel brake when a signal appears which indicates a tendency toward locking, in which test the over-braked vehicle wheel enters a state of high slippage, whereby the test circuit determines how the wheel behaves at the given coefficient of friction between the road surfaces and the tire, and whereby on the basis of this determination, the test circuit either provides a state in which the brake pressure is regulated or else switches to a state in which the control is made ineffective for at least some of the wheel brakes.

Abstract: An antilocking control system for the wheel brakes of a vehicle wherein the control system is of the type including sensors for monitoring the rotational behavior of the wheels, an evaluation circuit which receives the signals from the sensors and which generates control signals based on the signals from the sensors, and a pressure reduction unit which receives the control signals and which has a setting for pressure buildup, a setting for pressure reduction, and a setting for keeping the pressure at least approximately constant; and wherein the evaluation circuit includes a switching arrangement for emitting a control signal for causing pressure reduction upon the occurrence of a tendency to lock, for emitting a control signal for keeping the pressure constant upon a wheel acceleration of a certain value, and for normally also emitting a control signal for keeping the pressure constant in the transition phase between the end of the control signal for reducing pressure and the beginning of the signal indicati