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What Causes the Abnormal Noise When Releasing the Brake During Startup?

2 Answers

Eleanor

07/30/25 12:07am

Here are the reasons for the abnormal noise when releasing the brake during startup: 1. The sound is caused by friction between the brake pads and brake discs. New cars may produce similar noises when braking, as new brake pads and discs require a break-in period. This noise is normal during braking. Both brake discs and pads are high-wear components that experience friction with each brake application, leading to natural wear over time. Excessive wear will eventually cause abnormal noises, so regular inspection and replacement are necessary. 2. Issues with the brake system. This is most likely due to improperly installed or aged rubber seals in the brake caliper, which can cause abnormal noises.

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Abigail

08/16/25 4:03am

Last time when I dropped off my child at school, I also heard a 'squeaking' sound when releasing the brake. The mechanic said it was mainly caused by rust formation on the brake discs due to moisture. Especially after rainy days or car washes, a thin layer of rust forms on the brake disc surface, and the friction from this rust layer when releasing the brake for the first time in the morning causes the noise. It's even more noticeable after driving through water, but the sound disappears after driving for a couple of minutes. Additionally, brake pads that are too hard in material can also cause abnormal noises, particularly during the cold start phase. Another possible cause is lack of lubrication on the caliper guide pins. Last month during my maintenance at the 4S shop, I had them apply anti-noise grease to all moving parts, and now for two months, the noise hasn't recurred.

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