Vehicle autonomous brake-apply system and method

A first vehicle autonomous brake-apply system (10) includes a vehicle hydraulic brake assembly (12), a vacuum booster assembly (14) operatively connected to the vehicle hydraulic brake assembly, a solenoid valve (16) operatively connected to the vacuum booster assembly, and an automatic controller (18) including an output signal (20) operatively connected to the solenoid valve. A second system uses a lateral-acceleration-sensor assembly in place of the automatic controller.