What Causes the Abnormal Noise When Braking a Car?
2 Answers
There are several reasons for abnormal noise when braking a car: 1. New cars or recently replaced brake discs/pads have a break-in period during which some abnormal noise is inevitable. The noise can manifest as vibration friction or sharp squealing sounds, which usually disappear after driving a few hundred kilometers. 2. During emergency braking, the brake pedal may produce continuous abnormal noise, sometimes accompanied by a pulsating sensation. This indicates the ABS system is activated, which is normal. In this case, simply press the brake pedal firmly to the floor (only applicable to vehicles equipped with ABS). 3. Some fine metal particles inside the brake pads may produce sharp, piercing sounds when lightly braking. This issue can be resolved by stomping on the brakes several times forcefully, removing and regrinding the brake pads, or replacing them with higher-quality ones. 4. Wear on the brake disc can create deep grooves around its circumference. Friction between the brake pads and the edges of these grooves causes abnormal noise. If the grooves aren't particularly deep, grinding the edges of the brake pads to avoid contact with the groove edges can solve the problem. For deep grooves, replacing the brake disc is recommended. Generally, it's advised to replace the brake disc after every two brake pad replacements. 5. The issue might be caused by incorrectly installed brake pads, which can be fixed by reinstalling them properly.
If you hear rattling or squealing noises when braking, there are usually several key reasons. The most common is severely worn brake pads, where the wear indicator starts rubbing against the metal, signaling it's time for replacement. Another possibility is uneven brake rotor surfaces with scratches or rust, causing irregular friction sounds. Other causes may include debris or dust stuck in the brake pads, creating noise when engaged, or improperly installed/loose brake calipers. I recommend taking this seriously, as it not only affects braking performance but may also increase stopping distance and accident risks, especially in rainy conditions. Immediately take your car to a repair shop to check brake pad thickness and rotor condition. Replace aged components promptly, and maintain smooth driving habits by avoiding sudden stops to reduce such issues and extend lifespan.
