BMW E90 Power Steering Fluid Flush: The Ultimate DIY Guide

Maintaining a well-functioning power steering system is crucial for a comfortable and safe driving experience. Flushing the power steering fluid in your BMW E90 is an essential part of regular maintenance that can enhance steering performance and prevent costly repairs. This comprehensive guide will provide you with step-by-step instructions on how to flush power steering fluid in your BMW E90, ensuring optimal steering response and longevity.

Materials and Tools Required

• New power steering fluid (refer to your BMW E90’s owner’s manual for the recommended type and quantity)
• Drain pan
• Funnel
• Rags or paper towels
• Pliers or wrench (optional)
• Jack and jack stands (optional)

Safety Precautions

• Allow the engine to cool down completely before starting any work.
• Wear safety glasses and gloves to protect yourself from fluids and debris.
• Avoid contact with hot engine components.
• Use only the specified power steering fluid to prevent damage to the system.

Step-by-Step Instructions

1. Locate the Power Steering Reservoir

• Open the hood of your BMW E90.
• Identify the power steering reservoir, which is typically a clear or translucent plastic container located near the engine.

2. Remove the Reservoir Cap

• Carefully twist and remove the cap on the power steering reservoir.

3. Drain the Old Fluid

• Use a drain pan to catch the old power steering fluid as it drains out.
• Insert a clean funnel into the reservoir to avoid spills.
• Use a turkey baster or a syringe to extract the old fluid from the reservoir.

4. Remove the Return Hose (Optional)

• If you want to flush the entire system, you can remove the return hose.
• Locate the return hose, which is typically connected to the reservoir with a hose clamp.
• Use pliers or a wrench to loosen the hose clamp and disconnect the hose.

5. Fill the Reservoir with New Fluid

• Pour the new power steering fluid into the reservoir using a funnel.
• Fill the reservoir to the “full” or “max” mark.

6. Start the Engine and Turn the Steering Wheel

• Start the engine and let it idle for a few minutes.
• Turn the steering wheel several times from lock to lock to circulate the new fluid.

7. Check the Fluid Level and Repeat

• Stop the engine and check the power steering fluid level in the reservoir.
• If the fluid level is low, add more fluid until it reaches the “full” mark.
• Repeat steps 6 and 7 until the fluid is clean and free of contaminants.

8. Reinstall the Return Hose (Optional)

• If you removed the return hose, reconnect it to the reservoir and tighten the hose clamp.

9. Top Up the Fluid

• Check the power steering fluid level one last time and top it up if necessary.

Resetting the Power Steering System (Optional)

• Some BMW E90 models may require a reset of the power steering system after flushing the fluid.
• Consult your owner’s manual for specific instructions on how to reset the system.

Tips

• Use a high-quality power steering fluid specifically designed for your BMW E90.
• Flush the power steering fluid every 30,000 to 50,000 miles or as recommended in your owner’s manual.
• Check the power steering fluid level regularly and top up as needed.
• If you experience any steering problems or leaks, have your vehicle inspected by a qualified mechanic.

Troubleshooting

• Leaking fluid: Check for loose connections, damaged hoses, or seals.
• Hard steering: The power steering pump may be faulty or the fluid level may be low.
• Whining noise: The power steering pump may be low on fluid or damaged.

Recommendations

Flushing the power steering fluid in your BMW E90 is a relatively simple and inexpensive maintenance procedure that can significantly improve steering performance and prevent costly repairs. By following the steps outlined in this guide, you can ensure that your BMW E90’s power steering system operates smoothly and efficiently for years to come.

Frequently Asked Questions

1. How often should I flush the power steering fluid in my BMW E90?

Flush the power steering fluid every 30,000 to 50,000 miles or as recommended in your owner’s manual.

2. What type of power steering fluid should I use?

Use a high-quality power steering fluid specifically designed for your BMW E90. Refer to your owner’s manual for the recommended type.

3. Can I flush the power steering fluid myself?

Yes, flushing the power steering fluid is a relatively simple DIY procedure. However, if you are not comfortable working on your vehicle, it is recommended to have it done by a qualified mechanic.