"The antiskid system stops the airplane for all runway conditions in a shorter distance than is possible with either antiskid off or brake pedal modulation."

• As you can see from the above quote, one of the important issues to realize is that the anti-skid system greatly increases the effectiveness of braking. In very simplified terms => anti-skid system provides the greatest possible brake pressure while not allowing the wheels to lock due to an excessive brake pressure being applied. Without the anti-skid system (manual braking) the braking effectiveness is reduced. With the anti-skid system inoperative we have to consider not only the brake effectiveness for landing (landing distance increases), but also the accelerate-stop distance for the take-off in case of engine failure before V₁ => with anti-skid inop the accelerate-stop distance increases.