How Do You Flush a Power Steering System?

To flush a power steering system, first elevate the front wheels of the vehicle and put a container beneath the power steering system to catch drained fluid, and then let the old fluid out, and refill the system. Circulate the new fluid throughout before flushing and bleeding the system.

  1. Get the system ready, and drain the old fluid out

    Lift the front wheels of the car off the ground, and put a tray beneath the system to catch any spillage. Unhook the low-pressure hose from the power steering pump, and let the system drain. Hook the hose back up when the system has drained.

  2. Circulate new fluid throughout the system

    Remove the cap on the power steering reservoir, and add fluid until it reaches the "Full" line. Put the cap back on. Turn on the engine, and rotate the steering wheel between its locking points. Listen for a buzzing sound, which indicates you have air caught inside the system. Run the engine for up to 15 minutes, continually turning the steering wheel back and forth to send fluid throughout the entire system and drive out any trapped air. Turn off the engine and let the system rest for several minutes.

  3. Flush and bleed the system

    Unhook the low pressure hose again, and let the system drain. Connect the hose again, and add power steering fluid until the level shows full again. Repeat the process of turning on the engine and rotating the wheel back and forth to take air out of the system. Lower the vehicle to the ground again, and start the engine. Turn the wheel between the two locking points to ensure that the system works when the vehicle has its weight on the tires.