Hydraulic power steering fluid degrades over time and can cause pump and rack failure if neglected.
If your vehicle has hydraulic power steering (identifiable by a fluid reservoir under the bonnet), the power steering fluid is a maintenance item that's often overlooked. Unlike oil, it doesn't burn off, so drivers assume it never needs changing — but it does degrade.
What Does Power Steering Fluid Do?
Power steering fluid transmits hydraulic pressure from the pump to the steering rack, amplifying your steering inputs. It also lubricates the pump and rack seals, preventing leaks and wear. Over time, the fluid becomes contaminated with moisture and worn seal particles, turning dark and acidic.
When Should It Be Changed?
Most manufacturers don't specify a power steering fluid change interval, which leads to it being perpetually overlooked. A good rule of thumb is every 2–3 years or 30,000 miles. Contaminated fluid causes accelerated wear of the pump and rack seals, leading to leaks and eventually expensive component replacement.
Signs of a Power Steering Fluid Problem
- Whining or groaning noise when turning the wheel, especially at low speed
- Steering heavier or stiffer than usual
- Fluid level dropping — indicates a leak somewhere in the system
- Dark, discoloured fluid in the reservoir
- Power steering warning light (on vehicles with electric pressure sensors)
PKA Automotive checks power steering fluid as part of every service. If your steering is feeling heavier or you've noticed a whining noise, contact us for a power steering system check.
PKA Automotive Ltd
Expert car and commercial vehicle servicing, repairs, and maintenance in Keighley, West Yorkshire. Serving customers across West Yorkshire and beyond.