Why is there a strange noise when braking on rainy days?

[FelicityDella]

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.

[Diane]

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.

[GideonLee]

As a novice driver with less than two years of experience, I was quite nervous when I first encountered strange noises while braking on rainy days. Later, after researching, I learned that this is quite common. The main reason is that rainwater causes rust or water droplets to accumulate on the surface of the brake discs. When you apply the brakes, uneven friction occurs, resulting in those squeaking or whooshing sounds. Everything is normal on sunny days, but the noise is especially noticeable in the first few minutes after starting the car in the rain, and it gradually disappears after a few more brake applications. I also noticed that if the car is parked outdoors for a long time and accumulates dust, rainwater mixed with dust can exacerbate this situation. A simple solution is to gently apply the brakes a few times in a safe area to wear off the rust. However, if the noise is too annoying or occurs frequently, I recommend thoroughly cleaning the brake discs or trying new brake pads to prevent minor issues from turning into major problems.

[LuciaAnn]

As an experienced driver, I've encountered brake noises on rainy days quite often. The main causes are temporary friction noises due to rust on damp brake discs or water ingress in the system. Usually, a few brake applications can eliminate the noise. However, if the sound is loud or progressively intensifies, it might indicate deeper issues like worn brake pads or foreign objects stuck in the system. For safety, it's best to avoid parking for extended periods in wet areas during rainy days. Checking the surface dryness of brake discs by hand when parking would be more prudent.

[DeLilliana]

I think it's quite common for brakes to make abnormal noises on rainy days. The main reasons are usually rust or moisture on the brake discs after rain, causing squeaking sounds due to abnormal friction when braking. When you first start driving, pressing the brakes a few times can often alleviate the issue. However, be cautious if the noise persists or worsens, as it might indicate a problem with the brake pads, which may need replacement. The solution is to drive at low speeds after rain and test the brakes before encountering any emergency situations. Additionally, regular car washes to keep the brake system clean can also help prevent such issues.

[McDakota]

As a daily driver, the noise from braking in rainy weather is always annoying, mainly because rainwater causes rust or water accumulation on the brake disc surface, resulting in scraping or whining sounds during friction. A few extra presses usually restore normal operation, but occasionally, severely worn brake pads or water ingress into the system may require professional inspection. Over time, not only is the noise disturbing, but it may also affect braking performance. Therefore, I've developed the habit of lightly pressing the brakes after parking in the rain to test for safety.