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What causes the abnormal noise when lightly pressing the brakes?

1 Answers

VonGarrett

07/30/25 7:26am

There are metal hard spots on the brake pads. Detailed explanations for the abnormal noise when lightly pressing the brakes are as follows: 1. Rust on the surface of the brake disc: First, it could be due to brake disc deformation or rust on the surface. If the vehicle's brake disc is deformed, it may sway left and right during braking, causing wear on the brake pads and resulting in abnormal noise. In such cases, grinding and repairing the brake disc should suffice. Additionally, if the brake disc surface is rusty, the brake pads scraping off the rust spots can also produce noise, which usually disappears after a few minutes. Two emergency brakes at high speed can also resolve this type of noise issue. 2. Mirror-like surface condition: Secondly, new cars or vehicles that have just had their brake pads replaced may produce sharp noises during braking. This happens because the brake disc surface becomes mirror-like after use, and the brake pads develop a hardened layer after friction with the disc. If this hardened layer rubs against the mirror-like brake disc, it can create a sharp, piercing sound. In such situations, simply grinding down the hardened layer will usually prevent the noise during braking. 3. Worn-out brake pads: Another possibility is that the brake pads are completely worn out, causing the limit plate to directly rub against the brake disc and produce noise. To avoid this, regularly inspect the brake pads. If they are only 1/3 of their original width or less than 0.5cm, they should be replaced promptly. Additionally, a loose brake shield can also cause noise during braking. In such cases, the vehicle should be taken to a nearby 4S shop or repair shop for reassembly.

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