2021 Mercedes-Benz AMG GT Brake Noise TSB

Symptoms of Mercedes-Benz AMG GT Brake Noise

Owners of 2021 Mercedes-Benz AMG GT vehicles may experience various noises emanating from the service brake system. These symptoms typically occur in different driving situations and ambient conditions. The reported noises include:

• General brake noises
• Brake squealing
• Brake whirring or howling
• Other unspecified brake noises

Cause of Brake Noise

The primary cause of these brake noises in AMG vehicles, including the 2021 Mercedes-Benz AMG GT, is identified as frictional vibrations within the brake system. AMG brake systems are engineered for high loads, which can lead to these noises under specific operating conditions and driving styles. Factors such as speed, brake pressure, and ambient conditions like temperature and air humidity can influence the occurrence of these vibrations.

Important Warnings for Technicians and Owners

Mercedes-Benz has issued specific instructions to ensure proper repair and prevent further issues:

• Paste Application: "IMPORTANT: Be absolutely certain to not allow paste between friction surfaces of the pad and disc!" This is critical to maintain proper braking function and prevent contamination.
• Adhesive Film: "NOTE: If the brake pad has a metal backing plate, there is no need to affix the adhesive film." Technicians should check the brake pad type before applying adhesive film.

Diagnosis for Brake Noise

To accurately diagnose the source of the 2021 Mercedes-Benz AMG GT brake noise, technicians should follow a structured approach:

1. Reproduce the Complaint: Confirm the noise can be reproduced, ideally with the customer present, and identify which axle or side the noise originates from.
2. Inspect Components: Check the affected brake system for wear, mechanical damage, or localized overheating. Replace any damaged components as necessary.
3. Assess Rotors and Pads: Visually inspect brake rotors and pads for condition, looking for signs of stagnation or uneven wear.
4. Clean Components: Thoroughly clean brake components to remove brake dust and debris.
5. Wheel Free Play Check: With the vehicle secured on a lift, start the engine, depress the brake pedal 3-4 times, and then check each wheel to ensure it turns freely by hand. If a wheel does not turn freely, this issue must be resolved before re-evaluating the brake noise.
6. Check for Additional Documents: Verify if any other specific documents exist for the particular model that might offer further guidance.

Repair Procedure Summary

The repair procedure for 2021 Mercedes-Benz AMG GT brake noise involves specific steps for both front and rear axles, focusing on cleaning, chamfering, and applying specialized materials.

Front Axle Work:

1. Remove the front axle brake linings.
2. Clean all contact points on the brake lining, caliper, and carrier.
3. Clean the bonding surface where pistons contact the back of the brake pad. Apply adhesive film to the backplate of the piston-side brake lining, referencing the