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October 20, 2025 Service bulletin

At low speeds and light brake pressure, brakes will make a groaning or honking noise

Mercedes-Benz technical service bulletin LI42.10-P-079904 for 2022-2025 Mercedes-Benz C300, 2024-2025 Mercedes-Benz E350 and 2023-2026 Mercedes-Benz GLC 300 and others.

Bulletin number
LI42.10-P-079904
Component
Service brakes
Summary
Complaint At low speeds and light brake pressure, brakes will make a groaning or honking noise. Cause Frictional vibrations with very light brake pressure/modulations. Remedy This condition can be duplicated on most vehicles. To validate, use a like for like reference vehicle. The noise is normal behavior under the conditions listed. With very light brake pressure this noise can be induced/caused due to normal brake pad and brake rotor vibrations. Exchanging brake components will not rectify.

Owners of these vehicles have filed 205 complaints in the brakes category.

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