Not saying this is the case here, but when I started driving, I was always told not to turn the wheels all the way to max steering angle due to stress on Power Steering pump, power steering rack, and stress to the front CV-Joints. If you did reach the max steering wheel limit, you were to back off a bit so that the steering wheel was not pinned to the max.
If you are hearing a clicking, it could very well be the balls in the CV joint assembly clicking against the end points of the slots / stops in their bores because you are at the max angle.