What component is used in a power steering system to assist the driver's efforts to turn the steering wheel?

The hydraulic assembly plays a crucial role in a power steering system by using hydraulic fluid to amplify the force exerted by the driver on the steering wheel. When the driver turns the steering wheel, a pump generates pressure in the hydraulic fluid, which then assists in moving the vehicle's wheels with less effort. This assistance makes steering easier, particularly at low speeds or when maneuvering in tight spaces, enhancing overall driving comfort and control.

Other components listed, such as sensors, primarily relate to monitoring or adjustments rather than directly assisting in steering. The master cylinder is associated with the braking system and does not contribute to steering assistance. The power booster, often linked with braking systems, is not the primary component for steering assistance. Hence, the hydraulic assembly is the specified component that directly aids in turning the steering wheel in a power steering system.