What Causes the Rustling Sound When Braking?
2 Answers
The reasons for the rustling sound when braking are as follows: 1. Foreign objects on the brake disc: When driving on complex road conditions, wheels can easily fling stones or other foreign objects. Unlike drum brakes, disc brakes can trap stones between the brake pads and the disc, causing noise when braking. 2. Severe wear of the brake disc: Sometimes the brake disc is directly scratched by foreign objects or hit by other objects, leaving pits on the surface. When the brake pads rub against an uneven brake disc, it can also produce a rustling noise. 3. Severe wear of the brake pads: After a certain period of driving, the brake pads become thinner due to long-term friction. Excessively thin brake pads not only reduce braking effectiveness but also cause noise during braking due to the thinning material.
The other day I was driving to the supermarket when I heard a rustling sound as soon as I stepped on the brakes, like sand rubbing against something. It scared me so much that I immediately pulled over to check. After getting home, I recalled that I had driven on a dirt road a few days prior, and dust or small stones might have gotten stuck in the brake pad gaps. A friend told me this is a common issue, especially after rain or driving through sandy areas, as contaminants can stick to the discs. I took the wheel off myself and checked—sure enough, there was accumulated dust. After a simple cleaning, the noise reduced. But the mechanic warned that ignoring it long-term could lead to more serious problems, like wearing out the brake discs or reducing braking power, which could compromise safety. Now, I make it a habit to inspect regularly and avoid slamming on the brakes on dirty roads. If I notice any issues, I take the car to a professional shop right away to check the brake thickness and lubrication system. Sharing this lesson to remind everyone not to overlook strange noises—early action can save both money and safety.
