Heulton after changing brake pads

Hello friends, after changing the brake pads, front, the brake swings up to a high frequency when braking. It sounds like an organ pipe – also so loud. the whole stem hums. Before the change everything was OK. Did one of you ever have this and know remedy? The facts: – Deuce 2006 – Brembo with the bean-shaped sheet metal logo – Einscheiben – 4-piston with DOT5 – SBS pads – Brake disc is 1 year old and runs round – Antiquiet paste (blue) on backs, pens and By the way: Is the rule true… ?: – Plate with angular cam > to the outside – rounded sides of the pads in the outlet direction of the brake disc – see attached drawing If so – the pads do not go into the brake shoe. The cams hit the rear edges of the housing and the pads can not be pressed in so far that the holes for the pin screws come on top of each other. I am perplexed.