Why do newly replaced brake pads make abnormal noises?
2 Answers
Reasons for abnormal noises from newly replaced brake pads: 1. The contact surfaces do not match. When installing new brake pads, the old brake disc was not polished, resulting in improper installation; 2. The brake system itself has defects, causing the brake pads to only partially contact the brake disc. This increases the pressure per unit area during braking, leading to abnormal noises; 3. The replaced brake pads are of poor quality, with overly hard materials containing many metal impurities. After replacing the brake pads, be sure to press the brake pedal several times to eliminate the gap between the brake pads and the brake disc, avoiding accidents caused by the first brake pedal press being ineffective.
I just changed my brake pads a few days ago and noticed a squeaking sound, which is quite concerning. Actually, many car owners have encountered this issue. The main reason could be that the new brake pads are in the break-in period, and the surface of the contact disc isn't smooth yet. After driving and applying the brakes a few times, the noise should naturally disappear. Another common issue is misalignment during installation—if the technician didn't align them properly, the pads might be clamped too tightly or too loosely. Alternatively, the brake disc might have grooves or uneven wear, causing noise when the pads rub against it. If dust or moisture gets in, it can also cause unusual sounds, especially after rain. I've personally experienced material mismatch issues, like using cheap pads with old discs, which resulted in loud squeaking. My suggestion is to drive a few dozen kilometers first to let them break in. If the noise persists, take your car to the shop immediately for inspection—don't delay, as it could affect safe driving. After all, brakes are a critical component.
