Why does a new car make abnormal noises when braking?

[SanLucy]

Reasons for abnormal noises when braking in a new car: 1. There is sand or foreign matter between the brake pads and brake discs. 2. Use of inferior or overly hard brake pads. Due to the unique design of disc brakes, some sand and foreign matter inevitably get between the brake pads and brake discs, which can also cause abnormal noises when braking. 3. Severe wear of the brake discs. If inferior brake pads are used, or if relatively hard foreign matter gets between the brake pads and brake discs, it can lead to abnormal wear of the brake discs. 4. Brake pad warning. Many people don't know how many kilometers to replace brake pads. In fact, there is no mandatory regulation on how many kilometers to replace them; just replace them when they are thin. Some brake pads have electronic warnings, while some low-end cars use warning tabs. If the wear degree of the brake pads reaches the warning line, a squeaking warning sound will be emitted, and they should be replaced in time.

[MadelineLynn]

It's quite common for new cars to make strange noises when braking, so don't worry too much. I've experienced similar situations several times. The main reason is that the brake pads and rotors of new cars are still in the break-in period, and their surfaces might be slightly rough or have tiny burrs, causing friction sounds when pressed. Additionally, the brake rotors might have some rust spots or small dust particles, especially after being parked for a while in humid weather, which can easily lead to squeaking. There might also be minor installation imperfections, such as misaligned brake pads or slight deformations during transportation. Don't rush to get it repaired—most of the time, the noise will disappear after driving a few hundred kilometers. However, if the strange noise persists for more than two weeks or is accompanied by other issues like steering wheel vibration or weak braking performance, then you should take it to a 4S shop for a technician to inspect. Remember to maintain the brake system regularly to extend its lifespan.

[DelKingston]

I just picked up my new car and noticed loud noises when braking. At first, I thought it was broken, which scared me into checking information and asking friends. The main reason is that the new brake components are in the break-in period, causing uneven friction. If the brake pads are made of harder material, they tend to make noise initially, especially when braking at low temperatures, producing squeaky sounds. Minor installation issues, such as loose screws or uncleaned protective film, cannot be ruled out. It's recommended to drive more on city roads and brake gently to help with the break-in. If the noise is too loud or occurs frequently, don't ignore it—visit a professional shop for diagnosis, as safety comes first. Regularly clean the wheel hubs when washing the car to avoid gravel buildup, which can reduce noise.

[StPaislee]

I've been driving for many years, and it's normal for new cars to have some brake noise during the break-in period. The surfaces of new brake pads and rotors aren't perfectly smooth yet, which can cause metallic scraping sounds during friction. If the vehicle has been parked for several days, slight rust on the rotors may also create unusual noises. This doesn't indicate any problem with the car - the sounds will typically disappear after some driving. However, if the noise becomes particularly harsh or if you notice increased braking distance, you should visit a repair shop to check for installation issues. Remember to regularly inspect your brake fluid to ensure overall safety.