Red Seal Truck and Transport Mechanic Practice Exam

What type of fluid is typically used in a power steering system?

1. Engine oil

2. Power steering fluid

3. Transmission fluid

4. Brake fluid

The correct answer is: Power steering fluid

Power steering fluid is specifically designed for use in power steering systems, making it the correct choice. This fluid is formulated to provide optimal hydraulic performance, ensuring smooth and responsive steering by facilitating the transfer of power from the steering wheel to the steering mechanism. Power steering fluid has additives that help reduce foaming, enhance lubrication, and protect against corrosion, which are essential qualities for the high-pressure environment of a power steering system. Engine oil, while compatible with different engine functions, lacks the specific properties needed for effective steering performance. Transmission fluid can sometimes be used in certain power steering systems, but it is primarily designed for use in automatic transmissions, where it serves a different purpose. Brake fluid is designed for hydraulic braking systems and has completely different chemical properties unsuitable for use in power steering applications. Thus, power steering fluid is distinctively necessary to ensure reliable and effective steering functionality.