What Causes the Squealing Noise When Braking in the Rain?
2 Answers
Here are the specific reasons for the squealing noise when braking in the rain: 1. Improper installation of brake pads: When installing new brake pads, if the old brake discs are not resurfaced, it can lead to a poor fit. Improper installation or installing new pads without resurfacing the old discs will cause the new pads to directly rub against the uneven surface of the old discs, ultimately resulting in uneven wear of the new brake pads. 2. Brake system malfunction: There may be inherent defects in the brake system, causing the brake pads to only partially contact the brake discs. This increases the pressure per unit area during braking, leading to abnormal noise. It is recommended to inspect components such as the calipers and guide pins. 3. Presence of foreign objects: Foreign objects can cause a mismatch in the contact surfaces, resulting in abnormal noise.
I've been driving for many years, and it's quite common to hear squeaky brakes on rainy days, mostly caused by rust forming on the brake discs after getting wet. When it rains, water reduces the friction coefficient between the brake discs and pads, and iron components are prone to oxidation and rust. When you apply the brakes, the rust gets scraped off, producing that squeaking sound. Additionally, if the brake pads are old or have accumulated dirt, the noise can become more noticeable in damp conditions. This isn’t a major issue—usually, the sound disappears after driving for a while as the rust wears off. However, if the noise persists or is particularly harsh, it's advisable to have the brake pads checked after the rain. If they're too worn, replace them promptly. Parking in dry areas can also help reduce rust formation and ensure safety. In short, occasional noise is fine, but frequent squeaking should be taken seriously.
