Sequence of works
1. Ask an assistant to turn the steering wheel all the way in both directions and leave it in this position for a short time.
2. At this point, maximum pressure is generated in the system, and possible leaks of the working fluid will appear.
3. From underneath the vehicle, inspect the steering gear area.
4. Also check the power steering pump and all hose connections. Leaking working fluid indicates leaks.
Publication taken from an online resource: www.mercedesman.ru