Abstract: A method and apparatus is disclosed for dynamically testing the operation of a vehicle anti-skid brake system of the kind which has first and second sensors associated with first and second vehicle wheels and which operates, when the brakes are being applied by the vehicle to release brake force to both wheels when either sensor senses imminent lock-up of its respective wheel. The method includes the steps of engaging the peripheries of both wheels with the peripheries of first and second motor-driven rolls, driving the rolls up to a high peripheral speed, applying and maintaining the vehicle brakes releasing the motor-drive to the first roll so that the first wheel tends to lock-up thereby actuating the anti-skid system, reapplying the motor drive to the first roll, releasing the motor drive to the second roll so that the second wheel tends to lock-up thereby actuating the anti-skid system, and generating signals in response to the actuation of the anti-skid system by either sensor.

Abstract: A method for dynamically testing the operation of a vehicle anti-skid brake system and for making a record thereof includes engaging a wheel of the vehicle with a rapidly rotating roller or the like and accurately measuring and recording changes in an appropriate operating characteristic of the wheel while the vehicle brakes are being fully applied with sufficient power to rapidly slow the roller to essentially zero rpm and simultaneously to cause the anti-skid system, if operating properly, to rapidly release and reapply brake force in a manner to cause the wheel speed to decrease in stepwise fashion. The rotating roller slips relative to the vehicle wheel during application of brake force so that the wheel will be accelerated by the roll during release of brake force.