Many drivers don't know how to use anti-lock brakes. PUMPING DISCARDS ALL BENEFITS of the system. Just apply firm, steady pressure to the brake pedal and continue to apply it until the emergency is resolved.
THE ABS SYSTEM WILL PUMP THE BRAKES FOR YOU. This reduces the risk of your vehicle skidding out of control and increases your ability to steer your vehicle. You will feel a jerking motion when you apply the brakes hard and it does feel rather strange.
It would be a good idea to do a test run. Choose an area away from all other vehicles - perhaps a large empty parking lot and press the brakes hard.
REMEMBER - NO PUMPING.