Wheel driven pump in a hydraulic brake system

1. Field of the Invention A hydraulic brake system for preventing wheel lock. The hydraulic brake system includes a variable displacement rotary pump that is activated by the rotation of an axle of a vehicle. A hydraulic control cylinder of the variable displacement rotary pump is operationally coupled to a master cylinder and a displacement piston of the hydraulic control cylinder is operationally coupled to a swash plate of the variable displacement rotary pump for manipulating an amount of brake fluid flowing from the variable displacement rotary pump to a wheel brake cylinder. An outlet port of the variable displacement rotary pump is operationally coupled to the wheel brake cylinder by a section of brake line and to a fluid reservoir through a throttle valve. An inlet port of the variable displacement rotary pump is operationally coupled to a reservoir outlet port by a section of brake line. The wheel brake cylinder is coupled to the wheel of the vehicle to slow down the vehicle when the wheel brake cylinder is activated. When the wheel is rotating, the variable displacement rotary pump is activated and when the swash plate is properly positioned, the variable displacement rotary pump creates brake fluid pressure thereby activating the wheel brake cylinder to slow down the vehicle. Moreover, if the wheel ceases to rotate, the variable displacement rotary pump ceases to apply pressure to the wheel brake cylinder thereby allowing the wheel to rotate once again.