When skid happened the wheel can't be used as control element of vehicle direction instead of decreasing the braking force. Anti skid braking sistem have been design by expert of automotive. Braking is done by mean of periodic braking force that closed to the maximum static force at certain frequency. Characteristic of this system is discribed at this paper by mean of experiment and teoritical study on testing vehicle's model. Model is rolling down from certain elevation and than to be braked with some braking mode automatically. Continue braking force can make the wheel skid and did not produce maximum effect of braking. Braking mode with periodically braking force vice versa can avoid skid but need to control the force and their ferquency to produce maximum effect of braking.