Brake testing method

A method of testing an anti-skid brake system installed in a wheeled vehicle, said brake system including a driver-actuated brake pedal and a control system having first and second sensors associated with the first and second wheels respectively for sensing a condition of the respective wheel which is indicative of imminent lock-up and a control circuit which in its normal operating mode is responsive to both sensors to release brake force to both wheels in response to the occurrence of said condition at either wheel and to rapidly reapply brake force in response to the disappearance of said condition, said method comprising:

• engaging the peripheries of the first and second rolls with the peripheries of first and second motor-driven rolls respectively, driving the rolls up to a high peripheral speed typical of high speed road driving thereby driving the wheels at a simulated high road speed, maintaining the motor drive to the rolls and actuating the brake system sufficient to apply the vehicle brakes and insufficient to produce said wheel condition which is indicative of imminent wheel lock-up, effecting said condition at said first wheel by releasing the motor drive to said first roll while maintaining the motor drive to said second roll, generating a signal at least in part from the sensed speed of either of the wheels, said signal having a predetermined characteristic which varies with said speed whereby said signal indicates whether said control system has been operated in its normal mode by the sensor associated with said one wheel, reapplying the motor drive to said one roll, effecting said condition at said second wheel by releasing the motor drive to said second roll while maintaining the motor drive to said first roll, and generating a system at least in part from the sensed speed of either of the wheels, said signal having a predetermined characteristic which varies with said speed whereby said signal indicates whether said control system has been operated in its normal mode by the sensor associated with said second wheel.