The manual steering system, also known as the mechanical steering system, is the earliest automotive steering technology. It transmits the rotational motion of the steering wheel to the wheels of the vehicle through a physical connection. The power steering system is developed on the basis of the manual steering system.

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.

In the current automotive market, hydraulic power steering systems (HPS) and electronic hydraulic power steering systems (EHPS) are still widely used, and both systems rely on power steering pumps.

They are not the same concept. Rack and pinion is a specific mechanical structure responsible for converting the rotation of the steering wheel into the steering of the wheels; while power steering is an auxiliary system designed to reduce the amount of effort required by the driver during steering.

HPS racks are more common in large vehicles and some high-performance models that focus on driving experience. These types of vehicles have high requirements for the durability, reliability and steering feel of the steering system, and the HPS system has obvious advantages in this regard.

The power steering rack is connected to the steering gear and steering wheel, and is responsible for converting the driver's steering instructions into actual steering actions of the wheels. Traditional mechanical steering requires a lot of force, while the power steering makes steering easier.

if it is only a small leak, the vehicle can still be driven for a short distance, but it needs to be checked and the hydraulic oil added frequently. However, if the oil leak is serious and the hydraulic oil is lost quickly, the vehicle may lose the power-assist function in a short time, and continuing to drive at this time will bring great risks.

The cost of replacing the steering rack varies depending on the model. For Mercedes-Benz models, the cost of replacing the steering rack is generally between $1,000 and $2,500. This cost includes the cost of parts and labor.

The hydraulic power steering rack and the four-wheel alignment seem to be two independent systems, but their working conditions are closely related. Although the hydraulic power steering rack mainly affects the steering ability of the vehicle, its good or bad condition will also indirectly affect the performance of the four-wheel alignment.

The total cost of replacing a Toyota Corolla hydraulic power steering pump ranges from $300 to $1,100, including parts and labor. The specific cost depends on the type of parts selected by the car owner, the type of repair shop and the economic level of the location.