Central Brake and Steer (CBS) is an optional caster/wheel system used to control a chair’s mobility with a simple three- position foot pedal with red and green pedal position indicators. When the red pedal indicator is depressed, the wheels are locked to keep the chair fixed in place. When the green pedal indicator is depressed, the swivel function is locked so the chair can be pushed forward in a straight line. When the pedal is parallel to the floor, all four wheels are free to roll and swivel, letting the chair move forward, backward, and side to side.