What Causes the Abnormal Noise from Newly Replaced Brake Pads?

[ReaganDella]

Newly replaced brake pads produce abnormal noise due to mismatched contact surfaces, as there is a required break-in period between the new brake pads and the old brake disc. More details about brake pads are as follows: 1. Installation of new brake pads without resurfacing the old brake disc: This leads to improper fitting. If the installation is mismatched or new pads are installed without resurfacing the old disc, the new pads will directly rub against the uneven surface of the old disc, eventually causing uneven wear on the new brake pads. 2. Material issues with the brake pads: If non-genuine brake pads are used, the larger particles in the pad material can easily generate noise during braking. 3. Installation problems: Lack of lubricating paste (also known as noise reduction paste) or improperly installed brake pad shims. In such cases, reinstalling the brake pads properly should resolve the issue.

[VanSamuel]

It's quite common for newly replaced brake pads to make noise. I've changed many brake pads and found that the main causes are improper installation or dust getting trapped in between. Right after installation, the friction surfaces of the brake disc and pads need to break in, so squeaking sounds within the first few days are normal. Once they smooth out, the noise should stop. However, if the noise persists, it might be due to incorrect torque during installation, misaligned brake pads, or insufficient lubrication of small components. Dust getting inside can also cause scraping noises, which can be fixed by simply rinsing with water or wiping with alcohol. Lower-quality brake pads made of softer materials are prone to deformation and wear, which can damage the brake discs over time. It's recommended to drive about a hundred kilometers for proper break-in. If the noise continues, take it back to the shop to check the installation details—don't underestimate this issue as it affects driving safety.

[AniyahLynn]

I recently changed my brake pads, and the squeaking noise while driving was really annoying. I asked a friend about it, and he said new pads have a break-in period—it's normal for them to make noise when they rub against the rotor. But mine kept squeaking for over a week, and I later found out it was because dirt or moisture got in during installation, causing that irritating sound. If the brake rotors aren’t clean, the new pads won’t fit properly, making the problem worse. My advice is to lightly press the brakes a few times before driving to speed up the break-in process; usually, the noise should go away within a few days. If the noise persists, don’t ignore it—it could mean the pads are misaligned or of poor quality. Address the issue promptly to avoid overheating and damaging the braking system. Don’t make the same mistake I did by delaying repairs, which almost caused me to lose braking power mid-drive—that’s a huge safety risk.

[Sylvia]

New brake pad squeaking is often caused by poor bedding-in, resulting in a harsh friction surface. Normally, the noise disappears after a few days of bedding-in. However, if it squeaks frequently, it may be due to dust or dirt residue on the friction surface during installation, or uneven brake discs scraping and causing noise. Low-quality brake pads with poor materials and unstable friction coefficients tend to squeak more noticeably. Through my research on brake systems, I've found that lack of lubrication or loose screws can also cause this. The solution is simple: clean the wheel hub and disc surface, and try spraying with professional brake cleaner. If the squeaking persists for more than a week, get it checked immediately to avoid serious trouble.