why does my BMW 3 Series E90/E91 (2005-2012) make a grinding noise when turning

Solution

1. Preparation

• Gather tools and parts required for inspection and repair.
• Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Inspect Power Steering System

• Step 1: Locate the power steering reservoir and check fluid level.
• Step 2: If low, top up with the appropriate power steering fluid (consult owner’s manual).
• Step 3: Start the engine and turn the steering wheel from lock to lock to bleed air from the system.
• Tools Required: Funnel, rags for spills.

3. Check CV Joints and Axles

• Step 1: Raise the front of the vehicle with a jack and secure it on jack stands.
• Step 2: Inspect the CV boots for tears or grease leakage.
• Step 3: Rotate the wheels and listen for any grinding noises from the CV joints.
• Tools Required: Jack, jack stands, flashlight.

4. Inspect Wheel Bearings

• Step 1: Grab the wheel at 12 o'clock and 6 o'clock positions and shake to check for play.
• Step 2: Spin the wheel to detect any roughness or grinding.
• Step 3: If play is detected, the wheel bearing may need replacement.
• Tools Required: Torque wrench, socket set.

5. Evaluate Suspension Components

• Step 1: Visually inspect struts, shocks, and bushings for any signs of wear or damage.
• Step 2: Check for any loose or broken components.
• Step 3: Replace any worn parts as necessary.
• Tools Required: Socket set, pry bar.

6. Reassembly and Final Checks

• Step 1: If any components were removed, reinstall them securely.
• Step 2: Lower the vehicle and remove jack stands.
• Step 3: Test drive the vehicle to ensure the grinding noise is resolved.