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Why is there abnormal noise after replacing brake pads?

1 Answers

LeEvangeline

07/29/25 11:54pm

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.

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