my BMW 5 Series has a grinding noise while braking, what should I check?

Solution

1. Preparation

• Gather necessary tools and parts.
• Secure the vehicle on a flat surface and engage the parking brake.
• Use wheel chocks to prevent movement.

2. Remove Wheel

• Tools Required: Lug wrench, torque wrench
• Sub-steps:
  1. Loosen the lug nuts slightly while the vehicle is on the ground.
  2. Raise the vehicle using a jack and secure it with jack stands.
  3. Remove the lug nuts completely and take off the wheel.

3. Inspect Brake Components

• Tools Required: Brake cleaner, inspection mirror, flashlight
• Sub-steps:
  1. Visually inspect the brake pads for thickness and surface condition.
  2. Check the rotors for grooves, cracks, or excessive wear.
  3. Ensure calipers are not binding and are functioning properly.
  4. Clean any debris from the brake assembly with brake cleaner.

4. Replace Components (if necessary)

• Tools Required: Socket set, torque wrench
• Parts Required: Brake pads, rotors (if damaged)
• Sub-steps:
  1. If pads are worn down to less than 3mm, replace them.
  2. If rotors are damaged, remove the caliper and rotor assembly.
  3. Install new rotors and secure them with appropriate torque specifications.
  4. Install new brake pads, ensuring proper orientation and secure them in place.

5. Reassemble and Test

• Tools Required: Lug wrench, torque wrench
• Sub-steps:
  1. Reinstall the wheel and hand-tighten the lug nuts.
  2. Lower the vehicle back to the ground and torque the lug nuts to manufacturer specifications.
  3. Pump the brake pedal to ensure proper seating of the pads against the rotors.