Brake slip-controlled hydraulic brake system for vehicles

Claim 1

A brake slip-control hydraulic brake system for vehicles, comprising a brake master cylinder and at least one wheel brake connected to the brake master cylinder, slip control means including a sensor which senses wheel rotational behavior, said slip control means being adapted to respond to the sensor signal and pursuant to a defined algorithm, operating a first electromagnetically actuated valve means to isolate the connection of the wheel brake to the master cylinder, said control means being further adapted to actuate a second electromagnetically actuated valve means to alternatively establish a hydraulic connection between a relief chamber and said wheel brake, or between said relief chamber and a reservoir, means for periodically varying the volume of said relief chamber, said volume variation being recorded by said control means, said control means establishing by way of said second valve means the connection of the wheel brake to the relief chamber for pressure reduction in the wheel brake during a phase of relief chamber volume increase and establishing by way of said second valve means the connection between the relief chamber and said wheel brake during a phase of relief chamber volume decrease to effect a pressure increase in the wheel brake.