Which of the following is NOT part of the steering system?

The steering system of a vehicle is primarily responsible for controlling the direction of the vehicle, and it is composed of various components that work together to achieve this function. The steering wheel, power steering pump, and steering column are all integral parts of this system.

The steering wheel is what the driver uses to direct the vehicle; it establishes the driver's input. The power steering pump plays a vital role in assisting the driver by providing hydraulic pressure to make steering easier, especially at lower speeds. The steering column connects the steering wheel to the steering mechanism and may include several components like the steering shaft.

In contrast, a strut is not a component of the steering system. Rather, it is part of the suspension system. Struts support the weight of the vehicle, absorb shocks from the road, and help maintain the alignment of the tires. Therefore, identifying the strut as not being part of the steering system is correct, as it serves a different purpose related to vehicle stability and comfort rather than steering control.