What does the power steering fluid reservoir do? The power steering fluid reservoir holds fluid which helps the power steering system aid you in turning your steering wheel while the vehicle is running. The steering system works by pumping fluid to the steering gear which applies the pressure needed to help you turn the steering wheel. Without power steering flui? your steering will no longer be power-assisted. How do you know you need your power steering fluid reservoir replaced? Turning the steering wheel is more difficult than usual When you turn your steering wheel you hear an unusual whining noise You discover power steering fluid is leaking How is the power steering fluid reservoir replaced by a mobile mechanic? A mobile mechanic will check the reservoir for a leak. If a leak is identifie? the reservoir will be replaced. Reservoir is checked again to make sure there are no leaks. How important is it to have your power steering fluid reservoir replaced? When the reservoir is broken it will not hold enough fluid to assist the system in running properly and can make it very hard and even dangerous to drive and turn the wheel.