ABS minimizes wheel lockup (skidding) from too much force at the brake pedal. When a tire skids, braking distance increases and control of steering decreases. If a wheel speed sensor indicates that a wheel is about to lockup, the ABS hydraulic control unit releases pressure at that one wheel to help the tire maintain road traction. The rapid pressure adjustments of the ABS may make the brake pedal pulse. This is normal. Apply firm constant pressure and do not pump the brakes. ABS does not always stop a vehicle faster, but it does help the operator maintain control.