Why does the car make a strange noise when braking?

[Johnny]

Car makes a strange noise when braking because the brake pads or discs are rusted. The following is an introduction about cars: 1. Definition of a car: According to the latest national standard "Terms and Definitions of Types of Automobiles and Trailers" (GB/T3730.1-2001) in China, a car is defined as follows: A non-track vehicle with 4 or more wheels, driven by power, mainly used for transporting people and/or goods; towing vehicles that transport people and/or goods; for special purposes. 2. Introduction to domestic car brands: Domestic car brands include Hongqi, Changan, Great Wall, Chery, Geely, Roewe, BYD, etc.

[DiLeilani]

I've been driving for almost ten years, and brake noise is something that really needs careful troubleshooting. Most of the time, it's due to worn brake pads—that sharp squealing sound comes from the wear indicator rubbing against the brake disc. If the brake disc surface is rusty or grooved, stepping on the brakes will produce a metallic scraping noise. Last time, my car had a small stone stuck in it, making a rattling sound every time I braked, but it stopped after driving a bit and the stone fell out. Temporary noise after rain is also common and not a big concern. The key is to identify the type of sound—persistent noise should be checked immediately. Don’t wait until the brake pads are completely worn out and damage the brake disc, as replacing the whole set will be much more expensive.

[MacBeckett]

A friend's car once had brake noise issues, and I went with him to the repair shop. The experienced mechanic said there are mainly three problem areas: brake pads thinner than three millimeters must be replaced, otherwise the metal backing will grind directly against the brake disc; uneven brake disc surfaces can cause a low-frequency humming vibration sound; and brake calipers not retracting properly can lead to squeaking noises. Additionally, low-quality brake pads with overly large metal particles can cause noise when braking. His car had new brake pads that weren't properly broken in, but after driving a few hundred kilometers, the noise disappeared. I suggest not buying cheap brake pads online—stick with reputable brands for the best results.

[McLillian]

This reminds me of my last road trip experience. At that time, there was always a clicking sound when I stepped on the brake, which later turned out to be caused by a loose dust shield rubbing against the brake disc. The mechanic said it needed immediate attention, as brake system issues can have serious consequences. Common abnormal noises can be categorized into several types: high-frequency squealing is mostly the brake pad warning, low-frequency humming indicates brake disc deformation, and a rustling sound may be new pads breaking in. It's best to test several times on flat roads, listening for sound differences when braking uphill and downhill, as this makes it easier to locate the fault point. Safety first—don't skimp on that inspection fee.