With the engine running, you should not hold the steering wheel to full lock for more than 15 seconds. Due to the long-term presence of the steered wheels in the extreme position fluid steering servo gets very hot.
This can lead to malfunction of the steering servo.
Each turn of the steering wheel all the way to a stationary vehicle is accompanied by a noticeable noise because the power steering hydraulic pump is heavily loaded. In addition, there is a short-term decrease in engine speed at idle.