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.

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.

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If the power steering pump fails or its performance deteriorates, the pressure of the hydraulic oil cannot be effectively transmitted to the rack and pinion, and the driver will feel that the steering wheel becomes abnormally heavy, especially at low speed or parking.

When bushings are worn or aged, many car owners will consider whether they can replace the bushings alone without replacing the entire rack and pinion. This approach is feasible in some cases, especially when the rack and pinion itself is not obviously worn or damaged.

The steering systems of midsize sedans and SUVs are more complex, and the weight of the rack and pinion steering system may increase slightly. Generally speaking, the steering system weight of such vehicles is about 5 to 7 kilograms.

The gears and racks in the rack and pinion system are metal parts, which will inevitably wear out during long-term use. When the wear of the gears and racks reaches a certain extent, the fit between the rack and the gear may loosen, causing the hydraulic oil to leak from the joint.

When the driver turns the steering wheel, the rotational motion of the steering wheel is transmitted to the pinion through the steering shaft. The rotation of the pinion drives the rack to move linearly, which pushes the wheel to turn left or right. This process accurately transmits the driver's steering input to the wheel to achieve vehicle steering control.

The structure of the recirculating ball steering system is relatively complex, involving screws, nuts, recirculating steel balls and multiple connecting rod components. This complexity makes the system more time-consuming and costly to manufacture and repair. In contrast, the rack and pinion steering system has a simple structure, consisting only of a rack and a pinion, which makes it cheaper to manufacture and relatively easy to maintain.