What Causes the Squeaking Noise of Brake Pads on Rainy Days?

[TeaganRose]

On rainy days, the squeaking noise from brake pads is caused by fine sand carried by rainwater adhering to the brake discs. After rain, the brake discs may rust and develop tiny particles. Brake pads come in hard and soft varieties—hard pads are more wear-resistant, but if there are small particles between the hard pads and the gray cast iron brake discs, they can produce a sharp squeaking noise. Pressing the brakes a few times to wear off these particles usually resolves the issue. Brake pads are critical safety components in a car's braking system, consisting of a steel plate, an adhesive heat-insulating layer, and a friction block. The steel plate is coated to prevent rust, and the coating process is monitored using an SMT-4 furnace temperature tracker to ensure quality by checking the temperature distribution during coating.

[Luca]

I've encountered the situation several times where the brake pads squeak while driving on rainy days, which was particularly annoying, but I later realized it's a normal phenomenon. It's mainly because the rainwater wets the brake discs or pads, forming a layer of rust film or moisture on the surface. When you press the brakes, the metal friction produces that sharp sound. Don't be too nervous; this isn't a sign of brake failure but rather the effect of moisture. However, if the car is often parked outdoors or in rainy areas, rusting will be more noticeable, and if the brake pads are heavily worn, the noise will be louder. Remember to gently press the brakes a few times after starting the car in the rain to help dry out the moisture and reduce noise. Of course, if the noise persists or is particularly harsh, it's necessary to check the brake system to avoid small problems turning into major troubles. During regular maintenance, I always remind myself to clean the brake discs to prevent rust buildup.

[DeKira]

The squealing sound from brakes after driving in rainy days makes me uneasy, which actually stems from damp conditions. Rainwater causes rust or water accumulation on the brake pads and rotors, leading to friction noises. Additionally, brake materials harden in humidity, making them more prone to sound. I don't think immediate repair is necessary as long as the noise isn't persistent. However, try to park in dry areas when possible. After rain, drive slowly at first to let the brakes work a few times, naturally drying the moisture. Moreover, if brake pads are heavily worn, exposed metal parts increase squealing frequency in wet conditions, so regular thickness checks are crucial. Choosing high-quality brake pads during replacement can reduce such occurrences. In short, don't neglect routine maintenance.

[DeAshlyn]

The squeaky brakes on rainy days make me a little nervous every time I drive. Simply put, it's caused by rust or moisture on the brake surfaces due to rainwater, which creates noise during friction. Don't worry about safety—this is completely normal, especially more noticeable in older cars. If the sound is too harsh or frequent, it's time to check for brake pad wear or unevenness. What you can do: Gently press the brakes after rain to warm them up and reduce the noise.