What Causes Brake Noise After Rain in Cars?
2 Answers
The reasons for brake noise after rain in cars include: fine sand carried by water adhering to the brake disc, rust on the brake disc after rain, brake system malfunction, or missing/damaged brake disc fixing screws. Braking, also known as deceleration, refers to the action of stopping or reducing the speed of moving locomotives, vehicles, other transport tools, or machinery. The general principle of braking is to fix a wheel or disc on the high-speed shaft of the machine and install corresponding brake shoes, bands, or discs on the machine base, which generate braking torque under external force. The car brake pedal is located below the steering wheel. Pressing the brake pedal causes the brake linkage to be pressurized and transmitted to the brake shoes on the brake drum, clamping the brake disc to slow down or stop the car.
I've been driving for over 20 years, and squeaky brakes after rain are very common. It's mainly because rainwater hitting the brake discs causes surface oxidation, forming a thin layer of rust. When you step on the brakes, the brake pads rubbing against this rust layer will produce a creaking or squeaking sound. Usually, driving a few hundred meters and applying the brakes several times will wear off this rust layer, and the noise will disappear. However, if the noise persists for several days after rain or sounds very sharp like metal scraping, it may indicate that the brake pads are worn thin or there's a foreign object stuck, requiring timely inspection. I've learned this the hard way—I used to think the car was broken and rushed to repair it, wasting money. Later, I gained some knowledge and realized how to save money and hassle. Occasionally, high humidity after rain can worsen the noise, which is normal—no need to worry. But safety comes first. If the noise continues, have a professional check the brake system to ensure it's functioning properly. Don't compromise on driving safety—it's dangerous if the brakes fail at a critical moment.
