Did you scream at the brake disc when the cold car started?

I often start with a cold car and then step on the brakes. There will be screams on the brake disc, that is, the screams of steel collision and friction. Awkward. What do other colleagues think? Do you have this phenomenon? The car stopped ringing after running for some distance. This sound should be mainly the sound of friction between brake pads and brake discs. Many car owners will find that the brakes of the car just washed have abnormal sound. This is because the brake disc is very hot after use, and immediately shrinks when it meets water, resulting in uneven surface, so it rubs against the brake pad and makes noise. In addition, this phenomenon sometimes occurs when you just use the car in the morning. Therefore, please pay attention to observe the abnormal sound law. If this is the case, but it disappears after a period of time, the problem is not big. In addition, there are some abnormal noises, that is, the process problems of brake discs and brake pads themselves. Like the early Fukang series, the abnormal brake noise can't be eliminated, which is related to the casting process of brake discs. Simple abnormal noise, but no steering wheel jitter or long braking distance, basically no need to repair, just get used to it. The sound is generated by the contact surface between the brake pad and the brake disc. The reasons are as follows: 1. When the brake pad has metal hard spots, the temperature of the brake pad is low and there are many metal particles on the brake pad. This is the quality problem of the brake pad itself. Brake pads can be removed and re-polished, or they can be replaced with better brake pads. 2. The brake pad is badly worn, and the brake pad is equipped with an alarm device. When the brake pad is worn to a certain extent, the precision protector will rub the brake disc and produce a sharp metallic rubbing sound. At this time, the brake pads should be replaced to avoid damaging the brake disc. 3. The brake disc is badly worn. After the brake disc is worn, a deep groove will be formed in one circle of the disc. At this time, the waiting is cold, the metal surface is hard, and the brake pads will produce abnormal noise when they contact the brake disc. The brake disc can be removed for maintenance or replacement. Most of what you said may be caused by wet weather, or after wading and washing the car at night. At this time, the brake pads and brake discs are easy to oxidize and rust, which leads to abnormal brake sound. After driving for a few kilometers or feet, the wear will be fine. This is a normal phenomenon. It may be because the contact surface between the new brake pad and the brake disc has not been completely run-in. After upshifting, the vehicle has a forward force acting on the brake disc, so when the brake is lifted in a semi-engaged state, it will generate friction and sound. Eliminate the alarm sound of brake wear! It is because there are metal particles that increase friction in the material of the brake pad, and the size and arrangement of these particles are irregular. When they encounter large particles, they will rub against the brake disc and scream! This phenomenon is not unique to nature. Listen carefully in the underground garage. Many cars are howling! There is no rule to follow in this phenomenon! It is said that ceramic brake pads are not easy to howl, but Scorpio uses Hitachi brake pads, which is quite reliable! Unfortunately, it was not replaced with bad ones! When you need to replace it in the future, you can try the ceramic brake pads of big brands! Thank you for the porridge. Have you ever stopped driving for two or three days and just started driving? And wash the car the first night and drive it the next day. At first, the brake disc will bang. @20 19