why is my BMW 3 Series E90/E91 (2005-2012) rear brakes making a squeaking noise

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Safety gear: gloves and goggles.
• Ensure the vehicle is parked on a flat surface and the parking brake is engaged.

2. Raise the Vehicle

• Use a jack to lift the rear of the vehicle.
• Secure with jack stands to ensure stability.

3. Remove the Wheel

• Use a socket set to remove the lug nuts and take off the rear wheel to access the brake components.

4. Inspect and Replace Brake Pads

• Inspection:
  • Remove the brake caliper bolts using a socket wrench.
  • Carefully slide the caliper off the brake rotor.
  • Inspect the brake pads for wear; if they are less than 3mm thick, replace them.
• Replacement:
  • Remove the worn brake pads from the caliper bracket.
  • Install new brake pads, ensuring they are properly seated.
  • Apply anti-squeal lubricant to the back of the pads if required.

5. Check and Clean Brake Rotors

• Inspect the brake rotors for scoring or uneven wear.
• If damaged, replace the rotors; otherwise, clean them using a brake cleaner and a clean cloth to remove dust and debris.

6. Reassemble Components

• Slide the caliper back over the new brake pads and rotor.
• Secure the caliper with the previously removed bolts, tightening to the manufacturer's torque specifications (typically around 30-35 Nm).
• Reinstall the wheel and lug nuts, tightening in a star pattern.

7. Lower the Vehicle

• Remove jack stands and lower the vehicle back to the ground.

8. Test Brakes

• Press the brake pedal a few times to seat the pads against the rotor.
• Check for any noises or issues during initial braking.