Which system in a vehicle involves both a hydraulic component and wheels?

The power-assisted steering system is specifically designed to make steering a vehicle easier for the driver. This system employs hydraulic components to amplify the force exerted by the driver when turning the steering wheel. The hydraulic fluid assists in moving the steering gear, which helps in turning the wheels more effortlessly, especially at low speeds or during maneuvering.

In contrast, while the brake system includes hydraulic components as well, its primary purpose is to slow down or stop the vehicle, rather than assist in steering. The suspension system supports the vehicle’s weight and absorbs shocks from the road, but it does not primarily focus on hydraulic assistance related to steering. The fuel system is responsible for delivering fuel to the engine and does not involve hydraulic components or influence the motion of the steering mechanism. Thus, the correct identification of the power-assisted steering system reflects its unique function of integrating hydraulic technology with the steering of the vehicle wheels.