What is the reason for brake noise after replacing brake pads?

[DiLyla]

After replacing the brake pads, the reason for brake noise is that the brake pads have not yet adapted to the brake disc and are in the break-in period. Brake pads, also known as automotive brake linings, refer to the friction materials fixed on the brake drum or brake disc that rotates with the wheel. The friction lining and friction block bear external pressure to generate friction, thereby achieving the purpose of vehicle deceleration. Precautions for purchasing brake pads: 1. Check the friction coefficient, which determines the braking torque of the brake pads. Too high a coefficient can cause wheel lock-up, loss of directional control, and burning of the pads during braking, while too low a coefficient results in longer braking distances. 2. Consider safety. Brake pads generate high temperatures during braking. At high speeds or during emergency braking, the friction coefficient of the lining decreases under high temperatures. 3. Check for comfort, including braking feel, noise, dust, smoke, and odor.

[DiHenry]

I just got new brake pads installed, and I immediately noticed a sharp squeaking noise whenever I brake, which is quite distracting while driving. Later, I asked an experienced friend and learned that new brake pads might have a rough surface that needs some time to wear in and properly fit with the old brake rotors, so the noise should gradually fade. Another possibility is that the mechanic didn’t clean off dust or debris during installation, causing small particles to get stuck between the pads and rotors, leading to friction noise. My friend suggested I drive a bit more, avoiding sudden hard braking, and instead use steady speeds to let the pads wear in naturally. If the noise doesn’t go away after a week, it might indicate scratches or warping on the brake rotors, and then it’s time for a professional inspection. Safe driving is the top priority—brake system issues are no joke.

[HavenDella]

I've been repairing cars for many years and often hear owners complain about frequent noises after replacing new brake pads. The most common reason is surface mismatch between the brake pads and discs. New pads may have harder materials and need a few days of driving to wear in smoothly. Installation is also crucial—for example, insufficient lubrication of the caliper can cause dry sliding pins to make noise. It could also be due to improperly adjusted shims or slight rust on the brake discs causing uneven friction. I recommend owners gently press the brake pedal to feel any changes in resistance, then check if the brake disc temperature is abnormal. If the noise continues to worsen, it might indicate risks like brake fluid leakage or caliper sticking, requiring immediate inspection at a repair shop. Brakes are a matter of life and death—don't risk major consequences over minor issues.

[Costa]

I just got new brake pads installed, and they make a squealing sound every time I brake, which makes me a bit nervous. My car-savvy buddy said this is quite common—new brake pads are like new shoes that need some breaking in. It could also be due to tiny dust particles left between the pads and rotors during installation, causing the squeak when they rub. He suggested I try gently braking a few more times while driving to see if the noise diminishes. If the sound persists after a few days, it might indicate improper installation, like misaligned shims or insufficient lubrication. In that case, don’t delay—head straight to the shop for a checkup. Safe driving is no joke; waiting until something goes wrong is too late.