What Causes the Loud Noise When Releasing the Brake During Car Startup?

1 Answers
Claudia
07/29/25 2:54pm
The reasons for the loud noise when releasing the brake during car startup are as follows: 1. Releasing the brake too slowly when starting. When the brake pedal is released gradually, the engine already has sufficient power to propel the car forward, but the brake hasn't been fully released yet. As a result, the moving wheels are restrained by the brake system, naturally causing abnormal noise. 2. The brake disc and brake pads are stuck together due to rust, causing abnormal noise. This situation usually occurs after driving in rainy weather and then leaving the car unused for several days. The brake disc and brake pads rust and stick together, resulting in noise when starting the car again. 3. The semi-metallic material of the brake pads. Brake pads contain a large amount of metal fibers, which can sometimes form metal particles. These particles produce a harsh noise when pressing or releasing the brake. This noise typically disappears after driving for a while. If it persists, it may indicate poor manufacturing quality, and it is advisable to replace the brake pads promptly to avoid scratching the brake disc.
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