Sound coming to the brake

I am in Cyprus, I use right-hand drive 207 1.4 trendy. In the past, there was a voice called vik vik when I was on the move, and I took it to the mechanic that it was simple. He said that the balls should change, we changed. Then I continued to take it to the peugeot service. The discs are making sounds, I changed them too. The sound has started to be pressurized recently, especially when the discs are cold in the morning, this noise does not occur.When it goes 20-30 km, when the brakes are pressed, there is a violent sound like krak krak krak and people like horns start to look back :) You have felt what a terrible situation it is. Unfortunately, in Cyprus, unfortunately hospital and car repair nightmare does not understand what happened. Let me write a few more details for possible questions.

There is no sound when pressing the gas, pressing the clutch while the car is going, there is no sound when going fast and pressing the brakes. When I press the brake near the pause at low speed (10-20km), it is synchronized with the tire rotation as a cracker and a metallic sound sounds like the two iron swarms together. Pads, discs, balls have been changed and checked, but the problem continues.