Abstract: An anti-skid brake control system for a multi-axle vehicle in which the braking of the wheels of one axle is controlled by the brake pressure of the brake cylinders of the wheels of another axle. The brake cylinders of the second axle are pneumatically connected via at least one pilot throttle valve to the brake cylinders of the first axle. A multi-position control valve is controlled by an electronic evaluating circuit to cause the pilot throttle valve to reduce the brake pressure that is applied to the brake cylinders of the another axle during a regulated braking application and to cause the pilot throttle valve to apply to the brake cylinders of the another axle the full brake pressure that is developed in the brake cylinders of the one axle during an unregulated braking application.

Abstract: Sensor devices detect the dynamic response of each vehicle wheel to braking pressure and produce control signals if the associated wheel rapidly decelerates, slips, or accelerates. When braking pressure is initially applied, a deceleration control signal output from the sensor associated with a low friction wheel actuates, through a co-control logic circuit network, exhaust of braking pressure on both wheels on the corresponding axle. Shortly a period of fast application of braking pressure on both wheels occurs for a preselected time interval. This application is extended, for the co-controlled wheel only, for a shorter time period established by a timer through the logic network. After a holding period for both wheels, but at different pressure levels, a brief increase in braking pressure is actuated until another deceleration signal is output by the controlled wheel sensor. This actuates an exhaust of pressure in both wheels.

Abstract: An antiskid control system for the individual regulation of fluid brake pressure at the respective wheels of a vehicle. The control system is modified so that a steering wheel experiencing high wheel/road adhesion is co-controlled during a cycle of wheel skid control at the steering wheel experiencing a low wheel/road adhesion value, such co-control being delayed at the onset of brake release at the low adhesion wheel, while the high adhesion wheel brake pressure is maintained constant to improve stopping distance.