What to Do If There Are Scratches on the Brake Disc?
2 Answers
It is normal for brake discs to have scratches, and shallow linear scratches are common. As long as the scratch depth does not exceed 0.6mm, there is no issue. Severe wear on the brake disc can cause vehicle vibration during braking. The wear limit for brake discs is 1mm, and they should be replaced promptly if abnormal wear occurs or the limit is reached. Here is additional information: 1. Inferior brake discs or drums in terms of material and structure can lead to premature wear of the brake pads. 2. Long-term damage to the brake calipers in the braking system can cause the brakes to not fully release, resulting in prolonged friction between the pads and the disc (or drum) and excessive wear. 3. The original brake pads may have a small design area, and prolonged high-speed driving, frequent braking, overloading, and exposure to high temperatures are also major causes of severe brake pad wear.
I've seen quite a few brake disc scratch issues, and usually, the first thing is to check how deep the scratches are. Light scratches might be normal wear or small stones stuck in the brake pads—not a big deal but don't take them lightly. It's best to gently sand the edges with sandpaper, but don't apply too much force to avoid disrupting the disc's balance. More importantly, inspect the brake pad wear; if the pad material is too hard or contains impurities, switch to softer ones to reduce scratching. Regular maintenance can prevent problems—I recommend cleaning the brake system every 5,000 km to remove dust and rust. If there's shaking or noise after sanding, it indicates a serious issue, and you should have a professional measure the disc thickness. If it's too thin, replace it for safety. Don't tinker with it yourself—it's risky. Braking is a matter of life and death—no room for carelessness.
