What is the reason for the abnormal noise of the brakes of the new Volkswagen Lavida

There will be a running-in period for a new car. During the running-in period, there will inevitably be some abnormal noises, which will usually disappear after running a few hundred kilometers. In addition, there are hard spots on the brake pads, the brake cylinder does not return to its position, the assembly of the brake pads is not in place, and there are small stones or water films between the brake discs, which will cause abnormal noise.

If there is abnormal sound when the vehicle brakes, there are usually the following situations: One of the factors is that the new car itself has a running-in period. In general, because some new cars have a relatively long inventory period and the brake discs of the car It is very easy to rust and there are rust spots, so if you step on the brakes during the running-in process of the vehicle, there will be abnormal noises, but usually after more than 200 kilometers of running-in, the abnormal noises will not be obvious , and it will be more powerful when braking. The second reason is that the master worker did not apply sound-absorbing paste or chamfer to the friction plate when replacing the new friction plate. In this case, the new brake disc cannot have a good contact with the friction plate Run-in, it will cause abnormal noise. The third reason is that when the vehicle passes through wading roads or muddy roads, hard foreign objects enter the gap between the brake pads and the brake discs. In this way, when the brake system is working, it will be stuck, and when the foreign matter runs into the gap of the brake disc, there will be abnormal brake noise.