Why is there a sound when stepping on the brake?

[Robert]

Excessive wear or foreign objects entering the brake pads can cause such abnormal braking noises, which are common in new cars or after replacing brake pads. Below is more detailed information about these three points: 1. Severe wear of brake pads: This usually occurs when the brake pads reach the warning line or are completely worn out. The noise is mostly a sharp metal friction sound, accompanied by reduced braking effectiveness. 2. New cars with harder brake pad materials are more prone to such noises, while softer brake pad materials are less likely to produce such abnormal sounds. Softer materials wear out faster, resulting in a shorter replacement cycle compared to harder materials. 3. While driving, tiny sand particles can get between the brake pads and discs, causing abnormal noises due to friction.