The reasons for stiff power steering are: 1. Insufficient or leaking hydraulic steering oil 2. Power steering pump failure 3. Steering rack wear or damage 4. Hydraulic oil quality problems 5. Belt problems 6. Air entering the hydraulic system 7. Tire problems

Whether it is a hydraulic power steering system or an electric power steering system, wear of mechanical parts is inevitable. This type of wear usually starts to show up around 100,000 miles, but it also depends on driving habits and road conditions.

The main reasons for Mercedes-Benz power steering system failure: 1. Aging or damage to hydraulic system components 2. Insufficient or contaminated hydraulic oil 3. Electrical failure in the electric steering system 4. Wear of belts or pulleys 5. Mechanical problems in the steering system 6. Inadequate maintenance or improper use

Mercedes-Benz first adopted power steering systems in its mass-produced models in 1958. The system was first used in the Mercedes-Benz 300 Series sedan (W189), a high-end luxury sedan favored by aristocrats and business elites.