Power mobility scooters do not have brake pedals. Rather, they have electric/magnetic brakes. When the rider lets up on the throttle, the magnetic brake automatically brings the scooter to a stop within 8-10 inches. It also locks the wheels when the power to the scooter is off so that the scooter cannot roll away.
Placing the drive/neutral lever into the neutral lever releases the magnetic brake so that the scooter can be easily pushed. However, when the scooter is in neutral, the scooter will not operate.