my BMW X3 makes a grinding noise when I brake, what's the problem?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface, and set the parking brake.
• Disconnect the battery for safety.

2. Remove Wheel

• Using a socket set, loosen the lug nuts on the affected wheel.
• Lift the vehicle with a jack and secure it with jack stands.
• Fully remove the lug nuts and take off the wheel.

3. Inspect and Replace Brake Pads

• Inspect: Remove the caliper bolts with a socket wrench and slide the caliper off the rotor.
• Check Pads: Examine the brake pads; if they are worn down to the wear indicators, they should be replaced.
• Replace Pads: Remove old pads and install new brake pads, ensuring they fit securely. Apply brake grease to the back of the pads if recommended.

4. Inspect and Replace Brake Rotors

• Inspect: Check the rotors for grooves, scoring, or warping.
• Replace Rotors: If damaged, remove the rotor by unscrewing the retaining screws. Install a new rotor, making sure it's seated properly.

5. Reassemble Brake Components

• Reattach the caliper over the new brake pads and rotor.
• Tighten caliper bolts to the manufacturer's specified torque (typically between 20-30 ft-lbs; consult a service manual for specifics).
• Reinstall the wheel and hand-tighten the lug nuts.

6. Final Checks

• Lower the vehicle to the ground and fully tighten the lug nuts in a crisscross pattern.
• Reconnect the battery.