Key points
- This comprehensive guide will walk you through the steps involved in flushing the power steering fluid in your BMW E90.
- Power steering fluid is responsible for transmitting hydraulic pressure to the steering rack, allowing you to turn the steering wheel with ease.
- Flushing the power steering fluid in your BMW E90 is a relatively simple procedure that can significantly improve your driving experience.
Maintaining your BMW E90’s power steering system is crucial for a smooth and responsive driving experience. Over time, the power steering fluid can degrade, leading to sluggish steering, noises, and even damage to the system. Flushing the power steering fluid is an essential maintenance task that can help keep your E90 running smoothly. This comprehensive guide will walk you through the steps involved in flushing the power steering fluid in your BMW E90.
Why Flush Power Steering Fluid?
Power steering fluid is responsible for transmitting hydraulic pressure to the steering rack, allowing you to turn the steering wheel with ease. Over time, the fluid can become contaminated with dirt, debris, and air bubbles, reducing its effectiveness. This can lead to:
- Sluggish steering: The steering wheel may feel heavy and difficult to turn, especially at low speeds.
- Noises: You may hear groaning, whining, or clunking noises from the power steering system.
- Fluid leaks: Damaged seals or hoses can cause fluid leaks, which can further contaminate the system.
- Damage to the power steering system: Contaminated fluid can damage the pump, rack, and other components, leading to expensive repairs.
Tools and Materials You’ll Need
Before you begin, gather the following tools and materials:
- A new bottle of BMW-approved power steering fluid (refer to your owner’s manual for the correct type)
- A drain pan
- A 10mm wrench
- A 17mm wrench
- A 19mm wrench
- A 22mm wrench
- A funnel
- A syringe or turkey baster (optional)
- Clean rags
- Gloves
- Safety glasses
Preparing for the Flush
1. Park the car on a level surface and engage the parking brake.
2. Let the engine cool down completely. Hot fluid can cause burns.
3. Locate the power steering reservoir. It’s usually located near the front of the engine compartment.
4. Remove the reservoir cap. Be careful as the fluid may be hot.
Flushing the Power Steering Fluid
1. Drain the old fluid. Use a drain pan to catch the old fluid.
2. Remove the return hose from the power steering pump. This hose connects to the reservoir and allows fluid to return to the pump.
3. Start the engine and let it idle. With the return hose disconnected, the fluid will flow out of the system.
4. Add new fluid to the reservoir. Use a funnel to slowly add the new fluid.
5. Continue running the engine until the new fluid flows out of the return hose. This indicates that the old fluid has been completely flushed out.
6. Reconnect the return hose.
7. Turn off the engine.
8. Top off the reservoir with new fluid.
Checking for Leaks
1. Start the engine and turn the steering wheel from lock to lock several times. This will circulate the fluid and help identify any leaks.
2. Inspect the system for leaks. Look for any signs of fluid dripping or pooling.
3. If you find any leaks, tighten the connections or replace the damaged hose or seal.
Final Steps
1. Replace the reservoir cap.
2. Dispose of the old fluid properly. Follow your local regulations for disposing of hazardous waste.
3. Test drive the car. Make sure the steering feels smooth and responsive.
4. Monitor the fluid level regularly. Top off the reservoir as needed.
Maintaining Your Power Steering System
To maintain optimal power steering performance, follow these tips:
- Change the fluid every 2-3 years or 30,000 miles.
- Inspect the hoses and seals regularly for signs of wear or damage.
- Avoid driving with low fluid levels. This can damage the pump.
- Use only BMW-approved power steering fluid. Using the wrong type of fluid can damage the system.
Power Steering Fluid Flush: A Smooth Ride Ahead
Flushing the power steering fluid in your BMW E90 is a relatively simple procedure that can significantly improve your driving experience. By following these steps, you can ensure that your power steering system is operating at its best. Remember to use the correct fluid, inspect for leaks, and maintain the system regularly to keep your E90 steering smoothly for years to come.
Quick Answers to Your FAQs
Q: What are the signs of a failing power steering system?
A: Signs of a failing power steering system include sluggish steering, noises from the power steering system, fluid leaks, and a burning smell.
Q: Can I use any power steering fluid for my BMW E90?
A: No, it’s essential to use only BMW-approved power steering fluid. Using the wrong type of fluid can damage the system.
Q: How often should I flush the power steering fluid?
A: It’s generally recommended to flush the power steering fluid every 2-3 years or 30,000 miles.
Q: Is it difficult to flush the power steering fluid myself?
A: While it’s a relatively straightforward procedure, it requires some mechanical knowledge and tools. If you’re not comfortable working on your car, it’s best to have a professional mechanic perform the flush.
Q: Can I top off the power steering fluid with any type of fluid?
A: No, only use BMW-approved power steering fluid. Adding the wrong fluid can contaminate the system and cause damage.