Why is there a strange noise when braking on rainy days?
2 Answers
Car brake noise on rainy days, specific situations are as follows: 1, Fine sand: It may be caused by fine sand brought up by water adhering to the brake disc, or rust on the brake disc after rain. 2, Malfunction: It could also be due to a malfunction in the brake system. Missing or damaged fixing screws of the brake disc can also cause brake noise. If the brake system is malfunctioning, it is necessary to go to a 4S shop or repair shop for inspection and repair. Additional information: Fine sand brought up by water adhering to the brake disc, humid weather or large temperature differences between day and night causing dew or rust on the brake disc after rain, which is equivalent to small particles. Car brake pads are divided into hard and soft types. Hard ones are more wear-resistant, but if there are small particles between the hard brake pads and the gray cast iron brake disc, there will be a sharp noise. The noise will stop once the small particles are worn away by braking.
As a driver with over ten years of experience, I've encountered the issue of abnormal noises when braking on rainy days multiple times. Typically, the reason is quite simple—rainwater soaks the surface of the brake discs, causing rust or dust buildup, which generates scraping or squeaking sounds when braking. Under dry weather conditions, the brake discs function normally, but during rainy days with high humidity, abnormal noises can be felt after a few initial presses, and most of the time, the rust wears off after a few more presses, making the sound disappear naturally. However, it's worth noting that if the abnormal noise persists or becomes sharp, it could indicate worn brake pads or foreign objects stuck in them, requiring a prompt visit to a repair shop for inspection. Additionally, long-term neglect of this situation increases the risk of brake system failure, especially affecting safety during high-speed driving or emergency braking. Therefore, I usually drive a short distance after rain and gently press the brakes a few times to warm them up beforehand.
