Abstract: A rear brake proportioning system for a vehicle which is enabled upon the rear wheel speed exceeding a wheel speed threshold and activated upon rear wheel slip exceeding a slip threshold.

Abstract: An antilock system for a motor vehicle braking system which includes a master cylinder which is connected with a brake fluid reservoir and which can be activated by a brake pedal in order to deliver brake fluid through a connecting line into at least one wheel brake cylinder. The system also includes an electromagnetic valve is arranged in the connecting line between the master cylinder and the wheel brake cylinder in order to establish or to interrupt the connection by an electronic control unit. The system further includes a fluid pump arranged in parallel to the electronic valve in order to remove brake fluid from the wheel brake cylinder, with the fluid pump being operable to deliver fluid in one direction and being shut off to block fluid flow in the other direction.