Hydraulic power steering systems require oil because hydraulic oil is the primary medium of energy transfer. In this system, the pressure generated by the hydraulic pump needs to be transmitted through hydraulic oil.

Specifically, Honda first equipped its North American version of the Honda Accord with a hydraulic power steering system as standard in 1982, which was the time node when Honda first adopted power steering technology on a large scale.

Reasons for noise in the hydraulic power steering system: 1. Insufficient hydraulic oil or oil mixed with air 2. Power steering pump failure 3. Steering rack failure 4. Poor quality or deterioration of hydraulic oil 5. Loose pipes or joints 6. Excessive pressure caused by the steering wheel hitting the bottom

Common faults of hydraulic power steering are: 1. Hydraulic oil leakage 2. Hydraulic pump failure 3. Steering power reduction or loss 4. Steering wheel vibration or abnormal noise 5. Steering wheel automatic return failure 6. Steering failure or loss of control

BMW's first model equipped with a power steering system was the BMW E3 launched in 1968, also known as the "BMW New Six" series. The E3 series is a model launched by BMW to enter the high-end luxury sedan market, aiming to compete with luxury cars such as the Mercedes-Benz S-Class.

In general, the service life of the hydraulic power steering rack is between 120,000 and 150,000 kilometers. However, this value is not absolute, because different use conditions will have different effects on its life.

From the late 1950s to the 1960s, more and more American automakers began to equip their models with power steering systems. During this period, power steering gradually evolved from an optional configuration for luxury models to a standard configuration for mid-to-high-end models.

If the steering rack leaks seriously, the owner may find obvious oil traces under the vehicle or near the steering rack. These oil traces are usually light yellow or amber in color and have a certain viscosity.

Based on the above-mentioned steering systems, the most advanced steering system is undoubtedly the steering-by-wire system (Steer-by-Wire, SbW). The steer-by-wire system is a fully electronic steering system that does not rely on mechanical connections.

The most direct power source for a hydraulic power steering system is the vehicle's engine. When the engine is started and running, the engine drives the hydraulic pump through a belt. Typically, the hydraulic pump is connected to the engine's belt drive system.