Shrewd noise while braking

Hello, my new Ignis has now 1500km. Relatively fast I noticed that when braking completely towards the end there is a loud sound to hear. This only ends when the car is standing. I hear nothing when driving and braking fast, but e.g. when braking strongly at the traffic light. The workshop looked briefly and meant the brakes would work technically and cleaned them. Unfortunately, the problem still exists. They built the brakes apart as far as I know. cht (sorry I don’t know about it). I assumed that my new car warranty would cover something like this, but I was told that the brakes were excluded and that you would have to ask the manufacturer for a culant if more was to be done. Does anyone have a similar sound or does anyone know what that could be? I don’t know about any other car. Maybe the cockroach also comes from another component? What would you do? Thank you and a lot of greetings