Anti-lock apparatus for a hydraulic brake system

Abstract

An anti-lock apparatus for a pump-reinforced hydraulic brake system which includes a foot-actuated brake valve and a hydraulic main brake cylinder, the main cylinder being attached to a closed brake circuit so that in the event anti-locking is required, pressure medium is drawn from the closed brake circuit under the control of a 3/2-way valve in order to lower the pressure. This lowering of pressure is monitored via a return line by a switchover valve dependent on reservoir pressure and the withdrawal of this volume takes place by way of a check valve which only opens the passage through the return line when the pressure on the secondary side is higher than that on the primary side. The piston of the main cylinder serves to mechanically control the return flow. The brake valve has a pedal path blocking, which is made effective when the auxiliary energy supply is intact and which becomes ineffective when this supply fails.

Dependencies are inferred from the claim text.