Mercedes-Benz GLC300 Brake Pad Noise Issue?
2 Answers
Mercedes-Benz GLC300 brake pad noise primarily stems from two causes: first, poor-quality brake pads, and second, abnormal wear between the brake disc and pads leading to grooves or scratches. The solution involves removing and resurfacing the brake pads. Below are specific reasons for brake pad noise: 1. Rusty brake calipers: Prolonged failure to replace brake fluid can cause it to degrade, leading to moisture buildup that rusts the calipers, resulting in friction noise. 2. Slow master cylinder return or malfunctioning brake caliper return mechanisms can also cause brake pad noise. 3. New vehicle break-in period: Both brake pads and discs are brand-new during this phase, and some noise is normal as they wear in. 4. Foreign objects between pads and discs: Road debris like gravel may get lodged between components during driving, creating noise during braking.
When I previously worked on repairing Mercedes-Benz vehicles, I often encountered brake pad noise issues, especially in mid-size SUVs like the GLC300, where the braking system is quite sophisticated. Common causes include overly hard brake pad materials or the presence of rust spots and dirt buildup, particularly in rainy and humid environments where water rust easily forms. Improper alignment during installation can also lead to uneven friction sounds. If the noise only occurs during initial movement or at low speeds, try driving for a while to let the brake pads warm up—the sound might lessen. Another factor is brake disc wear; Mercedes' original discs have a unique design, and deep grooves can easily generate noise. I remind owners not to overlook minor issues and to promptly visit a professional shop for an instrument check. This not only extends the brake system's lifespan but also helps prevent accidents.
