Why is there a noise when stepping on the car brakes?

[David]

There are several reasons for abnormal noises when braking in a car: 1. Rust on brake discs or brake pads: After parking for a long time, especially in humid climates or after rain, rust or dirt may appear on the brake discs or brake pads. This usually resolves after driving for a while, or you can apply butter or specialized lubricant at the connection between the brake pads and brake calipers. 2. New brake pads: New cars or recently replaced brake pads may produce similar noises. New brake pads and discs require a break-in period, and such noises are normal during this time. However, if the noise persists after driving for a while, there may be an issue. 3. Excessive wear on brake discs and brake pads: Both brake discs and brake pads are high-wear items. Each time you brake, these components rub against each other, leading to wear over time. Excessive wear can cause abnormal noises, so regular inspection and replacement are necessary. Typically, brake pads should be replaced every 60,000 to 80,000 kilometers, while brake discs should be replaced every 100,000 to 120,000 kilometers. 4. Improper installation: If the brake pads are installed incorrectly or the model does not match, abnormal noises may occur. In such cases, the brake pads should be reinstalled. It is recommended to have brake pads installed at a professional auto repair shop.