Why does the Audi A8 make abnormal noises when braking?

[TravisFitz]

Audi A8 makes abnormal noises when braking, this sound is not a malfunction, mainly related to the material of the brake pads. Extended content on abnormal noises when braking can be classified as follows: 1. A sharp and piercing sound when braking: New cars may produce a sharp and piercing sound when braking, which might lead one to think there is a quality issue with the vehicle. However, this is not the case. New brake pads and brake discs require a break-in period. When braking, if the pads happen to rub against a hard spot on the brake pad (due to the material), this sound is produced, which is completely normal. 2. A dull sound when braking: This situation is mostly caused by a malfunction in the brake caliper, such as wear on the sliding pins or detachment of the spring plates, which can prevent the brake caliper from functioning properly. 3. A hissing sound when braking: It is more difficult to determine the exact fault with this type of sound. Generally, issues with the caliper, brake disc, or brake pads could produce this noise. If the noise occurs right after installing new pads, it might be due to a size mismatch between the new pads and the friction blocks.