why does my Volkswagen Passat B8 (2015-2022) make a grinding noise when braking?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface and engage the parking brake.
• Wear safety glasses and gloves for protection.

2. Remove Wheel

• Use a lug wrench to loosen the lug nuts.
• Raise the vehicle using a jack and secure it with jack stands.
• Completely remove the lug nuts and take off the wheel.

3. Inspect Brake Components

• Brake Pads:
  • Remove the brake caliper bolts using a socket set.
  • Slide the caliper off the rotor and support it without stressing the brake line.
  • Inspect the brake pads for wear; replace if they are below the manufacturer's minimum thickness.
• Brake Rotors:
  • Check the rotor surface for scoring or grooves. If damaged, proceed to replace the rotors.
  • Use a micrometer to measure rotor thickness; replace if out of specification.

4. Replace Brake Pads and Rotors (if necessary)

• Brake Pads Replacement:
  • If needed, install new brake pads according to the manufacturer’s specifications.
  • Ensure the pads are properly seated in the caliper bracket.
• Brake Rotors Replacement:
  • If rotors are replaced, clean the new rotors with brake cleaner to remove any protective coating.
  • Install the new rotors and torque to specifications.

5. Reassemble and Test

• Reinstall the brake caliper and torque the caliper bolts to the vehicle manufacturer's specifications.
• Reattach the wheel and hand-tighten the lug nuts.
• Lower the vehicle and torque the lug nuts to the specified value.
• Test the brake system by pressing the brake pedal several times to ensure proper pad seating.

Tools Required:

• Lug wrench
• Jack and jack stands
• Socket set
• Brake cleaner
• Micrometer (for rotor measurement)
• Torque wrench

Parts Required:

• Brake pads
• Brake rotors (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Always disconnect the battery before working on electrical systems, especially if the vehicle has electronic brake assist.
• Allow the vehicle and components to cool before working on the brakes to avoid burns.