Power Steering Fluid Flush

Power steering fluid transfers pressure, lubricates, and removes heat from the system. It must be able to withstand the high pressures and temperatures found in today’s hydraulic power steering systems.

When it turns dark brown or black colored, it has oxidized and lost its fundamental properties. Particles from the pump and rack and pinion collect at the bottom of the reservoir. If not flushed, varnish forms, seals begin to harden, and hoses deteriorate.

Fresh power steering fluid contains additives that protect seals, hoses, and the power steering pump and rack and pinion from premature wear.

A four step guide that shows how to flush a power steering system.

These systems usually contain a couple of pints of fluid. Generally, the exchange process includes using a fluid extractor or disconnecting the return hose from the pump to drain the fluid and then replacing the hose and refilling the reservoir. Then starting and immediately shutting down the engine. Repeat this process three or four times in a row to replace the old fluid.

The illustration shows a power steering fluid flush. It may require a helper and several quarts of fluid depending on how dirty and contaminated the system is.

Always use the correct fluid and flush or change the fluid according to the manufacturer’s specifications. Some manufacturers recommend flushing with a solvent-free power steering cleaner before a regular fluid exchange or every 50,000 miles. It helps remove harmful deposits and debris that lead to power steering problems.