why does my BMW 3 Series F30/F31 (2012-2019) shake when I brake?

Solution

1. Preparation

• Gather tools and parts required.
• Park the vehicle on a flat surface and engage the parking brake.
• Lift the vehicle using a jack and secure it with jack stands.

2. Remove Wheel

• Use a lug wrench to loosen and remove the wheel nuts.
• Take off the wheel to access the brake components.

3. Inspect Brake Components

• Remove the brake caliper:
  • Use a socket set to unbolt the caliper from its bracket.
  • Secure the caliper with a bungee cord or hang it to avoid strain on the brake line.
• Inspect brake pads for uneven wear; replace if necessary.
• Check the rotors for warping:
  • Use a runout gauge to measure the rotor’s runout; if it exceeds manufacturer specifications, replace the rotor.
• Measure rotor thickness with a micrometer; replace if below specifications.

4. Replace Brake Components

• If rotors are warped, replace them:
  • Remove the rotor from the hub.
  • Install the new rotor, ensuring it is properly seated.
• Replace brake pads:
  • Insert new pads into the caliper bracket.
  • Reinstall the caliper over the new pads and torque bolts to the manufacturer’s specifications.

5. Reassemble and Test

• Reinstall the wheel and tighten the lug nuts in a star pattern to the specified torque.
• Lower the vehicle and perform a test drive to ensure the issue is resolved.