Steering & Suspension: Steering Systems: Steering system procedures
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Topic IntroductionHelp

Flushing a power steering system

Summary
The objective of this procedure is to show you how to flush & bleed a power steering system. When circulating the fluid allow the engine to run for 10 to 15 minutes, turning the steering wheel from lock to lock several times to remove any air trapped in the system and circulate fluid through all parts of the system.

Part 1. Preparation and safety

Objective

Flushing a power steering system

Personal safety

Whenever you perform a task in the workshop you must use personal protective clothing and equipment that is appropriate for the task and which conforms to your local safety regulations and policies. Among other items, this may include:

If you are not certain what is appropriate or required, ask your supervisor.

Safety check

Points to note


Part 2: Step-by-step instruction

  1. Prepare the vehicle
    Safely raise the vehicle to make sure the front wheels are off the ground and locate the catch tray under the power steering system.
  2. Drain the system
    Disconnect the low-pressure hose from the steering pump at its lowest point and allow the system to drain. Reconnect the hose.
  3. Refill the system
    Unscrew the power steering reservoir cap, and pour recommended fluid into the reservoir until it is at the correct level. Replace the cap.
  4. Circulate the fluid
    Start the engine and turn the steering wheel from lock to lock. If you hear a ‘buzzing’ sound as you turn the steering wheel there is air trapped in the system. Allow the engine to run for 10 to 15 minutes, turning the steering wheel from lock to lock several times to remove any air trapped in the system and circulate fluid through all parts of the system. Turn off the engine and allow the system to rest for a few minutes.
  5. Flush the system
    Disconnect the low pressure hose and allow the system to drain. Reconnect the hose, and pour recommended fluid into the reservoir until it is at the correct level.
  6. Bleed the system
    Start the engine and turn the steering wheel from lock to lock several times to purge air from the system. Turn off the engine. Top up the power steering reservoir if necessary. Lower the vehicle. Start the engine, and turn the steering wheel from lock to lock to check the system is working correctly with the vehicle load on the tires. Dispose of the waste power steering fluid in an environmentally approved way.