Due to the different viscosities and compositions of the transmission fluid, it may not provide the ideal lubrication required by the power steering system. This will cause increased friction inside the pump and pipes, and long-term use may accelerate wear and shorten the life of the pump.

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

The performance of a repaired power steering rack depends on the quality of the repair and the severity of the problem. In some cases, the repair may not fully restore the original performance of the rack, especially when the internal mechanical parts are already severely worn.

When the rack and pinion system fails, the vehicle's driving trajectory may be abnormal. For example, the vehicle may deviate from the straight driving trajectory even if the steering wheel is in the neutral position.

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.