What to Do About Brake Noise After Rain?

[Hank]

After rain, fine sand carried by water can adhere to the brake discs, and if there are small particles between the discs, it can cause a sharp noise. Missing or damaged fixing screws on the brake discs can also lead to abnormal brake noise. If there is a malfunction in the brake system, the car needs to be inspected and repaired.

[AlexaLee]

I've encountered brake squealing several times after rain, usually caused by rust or dust/sand sticking to the brake rotors when they get wet. The simplest solution is to drive at a safe location for a while at moderate speed, gently applying the brakes about ten times to let the friction remove the rust or dirt – the noise will likely disappear. If it persists, the brake pads might be too thin or contaminated. In that case, check the pad thickness; if they're nearly worn out, replace them. As someone who enjoys DIY car maintenance, I recommend parking in dry spots after rain to avoid water accumulation, regularly washing the car (including brake cleaning) post-rainfall, and using an air gun to blow away dust – these habits prevent issues. Remember: occasional squealing is harmless, but if it lasts several days, investigate promptly to avoid safety risks.