my BMW 3 Series G20/G21 (2019-2024) brakes make a grinding noise, what could be wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Wear safety goggles and gloves.

2. Remove Wheels

• Tools Required: Jack and jack stands, lug wrench
• Lift the vehicle using the jack and secure it with jack stands.
• Remove the wheel nuts using a lug wrench and take off the wheel.

3. Inspect and Replace Brake Pads

• Tools Required: Socket set, brake pad spreader
• Remove the caliper bolts with a socket set and carefully detach the caliper from the rotor.
• Use the brake pad spreader to compress the caliper piston.
• Remove the old brake pads from the caliper bracket.
• Install new brake pads ensuring they are properly positioned.

4. Inspect and Replace Rotors (if necessary)

• Check if the rotors are within specification; if they are damaged, remove them.
• Tools Required: Brake rotor removal tool, torque wrench
• Install new rotors (if applicable) and torque to manufacturer specifications.

5. Reassemble and Test

• Reattach the caliper and secure it by tightening the bolts to manufacturer specifications.
• Reinstall the wheel and hand-tighten the lug nuts.
• Lower the vehicle and fully tighten the lug nuts in a crisscross pattern.
• Pump the brake pedal to seat the brake pads.