What Causes Brake Noise When the Car is Cold?

[VonCooper]

The causes of brake noise when the car is cold are: 1. For new cars, since the brake pads and discs are new and still in the break-in period, they may produce a slight hissing sound, which is normal and usually disappears automatically after a few hundred kilometers; 2. There are foreign objects between the brake pads and discs, such as small particles like sand or small stones entering between them, which can cause a hissing sound; 3. The brake discs and pads are stuck together due to rust, causing noise. This usually happens after driving in the rain and then leaving the car unused for several days. The rust causes the brake discs and pads to stick together, resulting in noise when starting the car again, which is also normal; 4. The brake disc fixing screws are missing or excessively worn, causing a mismatch with the brake pads and resulting in noise; 5. The brake pads are nearly worn out, which may cause a screeching sound. If this occurs continuously for several days and the noise becomes louder and more frequent, it generally indicates that the brake pads are almost worn out and need to be replaced.