DIY Power Steering Pump Repair for BMW E90: Step-by-Step Instructions

Maintaining your BMW E90 is essential for a smooth and safe driving experience. Among the crucial components, the power steering pump plays a vital role in providing effortless steering control. If you’re experiencing difficulty in turning your steering wheel or notice unusual noises, it may be time to replace the power steering pump. In this comprehensive guide, we’ll provide a step-by-step tutorial on how to change the power steering pump in your BMW E90.

Required Tools and Materials

Before embarking on this task, gather the following tools and materials:

• New power steering pump
• Fluid extractor or turkey baster
• Power steering fluid
• Socket set
• Wrench
• Funnel
• Rags or paper towels
• Safety glasses

Safety Precautions

Before starting any work on your vehicle, ensure you take appropriate safety precautions:

• Park your car on a level surface and engage the parking brake.
• Allow the engine to cool completely.
• Wear safety glasses to protect your eyes.

Step-by-Step Instructions

1. Locate and Disconnect the Battery

Open the hood and locate the battery. Disconnect the negative (black) terminal using a wrench.

2. Drain the Power Steering Fluid

Use a fluid extractor or turkey baster to extract as much power steering fluid from the reservoir as possible.

3. Remove the Drive Belt

Locate the power steering drive belt and use a wrench to loosen the tensioner pulley. Remove the belt.

4. Disconnect the Power Steering Lines

Use a wrench to loosen the high-pressure and low-pressure lines connected to the power steering pump. Cap the lines to prevent fluid leakage.

5. Remove the Power Steering Pump

Locate the three bolts holding the power steering pump in place. Remove the bolts and carefully remove the pump from its mounting bracket.

6. Install the New Power Steering Pump

Align the new pump with the mounting bracket and secure it using the bolts. Tighten the bolts to the specified torque.

7. Connect the Power Steering Lines

Reconnect the high-pressure and low-pressure lines to the new pump. Tighten the fittings securely.

8. Install the Drive Belt

Place the drive belt back on the pulleys and adjust the tensioner pulley to provide the correct tension.

9. Fill the Reservoir with Power Steering Fluid

Use a funnel to fill the power steering reservoir with the specified type and amount of fluid.

10. Bleed the Power Steering System

Start the engine and let it idle. Turn the steering wheel from lock to lock several times to bleed any air from the system. Check the fluid level and top up if necessary.

11. Reconnect the Battery

Reconnect the negative battery terminal.

Final Checks

Once you have completed the installation, perform the following checks:

• Ensure there are no leaks from the power steering system.
• Check the power steering fluid level and top up if necessary.
• Test the steering system by turning the steering wheel from lock to lock.

Summary: Empowering Your Steering

By following these steps, you can successfully change the power steering pump in your BMW E90. This repair will restore your steering system’s functionality, ensuring a smooth and responsive driving experience. Remember, regular maintenance and timely repairs are crucial for maintaining the optimal performance and longevity of your vehicle.

Top Questions Asked

1. How often should I change the power steering pump?

The power steering pump typically lasts for several years or over 100,000 miles. However, it’s recommended to have it inspected regularly, especially if you notice any problems with your steering.

2. What are the symptoms of a failing power steering pump?

Symptoms of a failing power steering pump include difficulty turning the steering wheel, whining noises, and leaks.

3. Can I drive with a bad power steering pump?

Driving with a bad power steering pump is not recommended. It can make steering difficult and dangerous, especially at low speeds.