NC ABS 2012-13 models, front and rear brakes calipers are separated (but in one body). Rear brake is acting on front wheel by separate caliper linked true proportional and differential valves. Practically it's uncontrolled action except when ABS action is required. New, electronically controlled system eliminates external valves. Distribution of braking fluid pressure to front and rear is done inside of ABS modulator and controlled by PCM. Honda claims improved braking and better control between front and rear, especially at low speed. I'm not sure if this is available for all models. Honda gives an example of super-bike. As usual, you have to pay for more advanced features, but in principal is the same.