What is the problem if the car makes abnormal noise when braking without warming up for two minutes?

[ElijahLynn]

The reason for abnormal noise when braking is the presence of foreign objects in the brake disc gap. Below are the specific causes and solutions: Foreign objects in the brake disc gap: Sometimes hard substances like sand and stones enter the gap between the brake disc and brake pad, causing abnormal noise. This usually occurs during the initial driving stage and can be ignored. After driving through water or off-road conditions like muddy roads, hard sand and stones can get into the gaps of the braking mechanism. When the braking system is engaged, these particles can cause jamming, leading to abnormal noise when they move into the brake disc gap. Excessive wear of the brake disc or a fractured brake pad, even if not heavily worn, can also cause abnormal noise. Replacing a new brake disc: Abnormal noise in new car brakes is normal and usually disappears after a running-in period of more than 200 kilometers, so there is no need to worry. Replacing new friction pads or a new brake disc may result in abnormal noise initially because the new brake disc cannot immediately achieve good running-in with the friction pads.

[Sienna]

My car has experienced this issue too. When I drive off without warming up the car, the brakes squeak, which is really annoying. This is likely caused by moisture or a thin layer of rust accumulating on the brake discs after parking, especially after rain or in humid weather. If you start driving immediately, the brake pads rubbing against that layer can create noise. Additionally, if the brake pads themselves are made of harder material or have become uneven after prolonged use, they may also produce more noise when cold. I remember this happening every day during winter before. Later, I found that lightly pressing the brakes a few times after parking to remove moisture, or regularly cleaning the brake components, can help reduce the problem. Ignoring it for too long may lead to reduced braking efficiency, so it's important to be cautious for safety. Occasionally checking the brake discs and pads for wear at a repair shop doesn't cost much but saves a lot of hassle. Also, some car designs require warming up during cold starts to avoid sudden braking.

[SanDominic]

As an ordinary person who drives frequently, I find that brake noise when the car is cold is quite common, and the reasons are usually not complicated. Eighty percent of the time, it's because the braking system hasn't warmed up yet, and the components are still a bit stiff, causing friction to be less smooth. You might hear that sharp scraping sound, which is often due to some dirt or slight rust between the brake pads and discs. My personal tip is, if you're not in a hurry, let the engine warm up for a minute or two, and gently press the brakes a few times to help remove the rust. If it happens frequently, check the wear on the brake pads to see if they need to be replaced with softer material. Also, don't rely solely on this; regular maintenance of the braking system is crucial, including cleaning dust and checking fuses—these small tasks matter. In safe driving, any noise is worth investigating to prevent small issues from becoming big problems.

[SanAyla]

The brake makes abnormal noises during cold starts, and I think we should start with safety issues for analysis. It's most likely due to accumulated dust or rust between the brake pads and discs, causing friction noise. Having driven for many years, I know this sound may seem minor but carries significant hidden dangers, especially when you brake hard, as it can easily lead to skidding. The main reasons are probably prolonged parking leading to moisture buildup or insufficient regular maintenance. The solution is simple: warm up the car for a few minutes before driving each time, and gently press the brakes to adapt. If the noise persists, check the condition of the brake components to see if cleaning or replacing the pads is necessary. Don't wait for it to worsen and affect braking distance, as that would significantly increase the danger. Pay attention to daily parking locations, avoiding areas with standing water, which can prevent many problems.