What are the reasons for noise in car brakes?
3 Answers
There are several reasons for noise in car brakes, including severely worn brake pads, excessively hard brake pad material, improper installation of the brake system, foreign objects between the brake pads and brake discs, rusted brake calipers, slow return of the brake master cylinder, and the installation of new brake pads. Severe wear of the brake pads is usually caused by the brake pads reaching the warning line or being completely worn out, often resulting in a metallic friction sound. If the brake pad material is too hard, it can easily cause noise. After replacing the original brake pads, noise may occur due to human factors. For example, if the mechanic installed the brake pads incorrectly, upon removal, it may be observed that only part of the brake pad surface shows friction marks, requiring reinstallation.
My car's brakes sometimes make a squealing noise, especially when slowing down or during rainy days. This is usually because the brake pads are worn thin or there's rust on the rotors. When you press the brakes, the friction components come into contact with metal, and without any buffer, it causes noise. If it squeaks after driving on dusty roads, it's likely due to dust particles getting stuck, and cleaning them should solve the issue. However, ignoring the problem can lead to bigger issues, such as excessively thin brake pads causing rotor wear or increased braking distance, which can be dangerous. I always remind my friends to regularly check the brake pad thickness and ensure it's at least 3mm or more, replacing them when necessary. Additionally, avoiding sudden braking during normal driving can extend their lifespan. If any issues are detected, never ignore them—safety comes first when driving. It's best to have a professional auto shop inspect and repair the problem, as they can accurately diagnose the issue and prevent potential hazards.
I've encountered brake noises many times. For example, after rainy days, there's squeaking, which is temporarily caused by rust on the disc surface and not a big issue—just drive a few rounds to wear it off. However, if the noise persists, especially when starting the car cold, it might indicate excessive wear on the brake pads, and they may need replacement. Once, I found an unusual noise caused by a small stone stuck in the brakes, and it disappeared after I cleaned it out. I recommend avoiding parking in damp places to reduce the chance of rust, and regular maintenance is crucial. I make it a habit to check every few months to prevent minor issues from turning into major repairs. Remember, brake noises are warning signals—never delay. Safety comes first. If braking performance is affected, visit a professional shop immediately; otherwise, the risk on highways is too great.
