Which component is part of the steering system in a truck?

The power steering cylinder is a crucial component of the steering system in a truck. It enhances the driver's ability to control the vehicle by reducing the amount of effort required to turn the steering wheel, especially when maneuvering at low speeds or when the vehicle is stationary. This hydraulic mechanism works by amplifying the force exerted by the driver on the steering wheel, allowing for smoother and more responsive steering.

In contrast, the brake pedal is integral to the braking system, allowing the driver to slow down or stop the vehicle. The clutch plate is part of the transmission system, enabling the driver to shift gears smoothly. The fuel line is essential for delivering fuel from the tank to the engine but has no role in steering. Therefore, the power steering cylinder is the only option that directly relates to the steering function of the truck, making it the correct choice in this context.