Why is there abnormal noise after replacing brake pads?

[LeEvangeline]

The reasons for abnormal noise after replacing brake pads are: 1. Poor quality: If the mold used to make the brake pads is not good enough, and the manufacturer does not properly control the dimensions and shape during production, such brake pads will have poor matching once installed on the vehicle, leading to localized stress concentration or excessive clearance in the brake pads, which naturally causes noise during braking. If there are issues with the material of the brake pads, such as localized hard spots or impurities, it can also produce sharp squealing noises when rubbing against the brake disc. 2. Not replacing the retaining clips: Brake pads come with retaining clips used for fastening, and the structure and number of these clips vary by vehicle model. The retaining clips of old brake pads have been used for a long time, so their fastening force decreases. If they are not replaced or not installed properly during the replacement, the brake pads may have slight movement within the caliper. Under strong braking force, even a tiny amount of movement in the caliper can produce a "clicking" abnormal noise. 3. Presence of debris: During the replacement of brake pads, if hard debris gets stuck between the brake pad and the brake disc, it can cause noise due to the high-intensity friction between the two. This is also the most common issue encountered by most car owners during vehicle use. Therefore, when replacing brake pads, it is essential to remind the technician to ensure the cleanliness of the brake pad and brake disc surfaces. It is best to clean them first with a non-greasy metal cleaner and then blow them clean with an air gun to avoid contamination by debris.

[DeElliana]

I also experienced squeaking noises when I just replaced my brake pads. It's mainly because the new pads' surfaces aren't perfectly smooth yet, causing that squeaky sound when rubbing against the rotors. Normally, this is called the break-in period - you need to drive about 200+ km to let them gradually wear in. Don't worry, it usually goes away after a few days. However, do watch out for potential installation issues like loose pads, misalignment, or dust contamination. In such cases, you should immediately return to the repair shop for readjustment. Also, extremely cold temperatures or rainy weather may amplify the noise - applying brakes gently can help reduce it. Remember this is a common minor issue that typically disappears after some highway driving.

[DelDominic]

Why does it squeak after changing brake pads? I think it's a material mismatch issue. The new pads might be harder or contain metal particles, causing squeaking when rubbing against the old rotors. Not cleaning residual debris properly during installation or failing to apply lubricant can also lead to noise. Check it yourself: drive slowly and brake a few times. If the noise persists, it's best to return to the shop to check the alignment of pads and rotors. Don't just wait – trapped debris may damage the rotors over time. This relates to pad material selection. I once had prolonged squeaking with semi-metallic pads, but switching to ceramic pads improved the situation significantly.

[Arabella]

The squeaking noise is really annoying. After I got new brake pads installed, I keep hearing a gurgling sound. It might be the break-in period or some small debris stuck in there. I don't know much about cars, but I heard that the noise should go away after driving for a while. If it persists for more than a week, I should take it back to the mechanic for a check-up. Don't ignore it—if something gets stuck, it could affect braking safety. A simple method is to feel the rotor with your hand to see if it's smooth, but it's better not to mess with it. Safety first.