No, much more. You don't understand how it works. A dual reservoir master cylinder splits the front and rear braking systems into two separate systems. I can cut a front brake hose IN HALF and although you will lose the front brakes completely, it does not affect the rear AT ALL. You still have full rear brakes and can stop the car. Same for the rear if they become disabled. You will still have brakes, although the pedal would be low, you could still stop.