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

The steering system in a vehicle is crucial for controlling the direction of travel, and it involves several key components that work together to provide precision and ease in maneuvering. Among these components, the suspension arm plays a different role than those directly related to steering. The steering wheel, power steering cylinder, and steering shaft all directly contribute to the steering mechanism.

The steering wheel is the interface that the driver uses to command the vehicle's direction. When the driver turns the steering wheel, this action is transmitted through the steering shaft to the other components of the system. The power steering cylinder assists in amplifying the driver's input, making it easier to turn the wheel and navigate the vehicle.

In contrast, the suspension arm is part of the vehicle's suspension system, which is designed to absorb shocks from the road and maintain proper tire contact with the surface. It does not have a direct role in steering the vehicle but rather supports vehicle stability and comfort during travel. Since the suspension arm is not involved in the act of steering itself, it is identified as not being a key part of the steering system. Understanding this distinction is essential for grasping the fundamental functions of vehicle components.