New brake set parking brake / hand brake -> no function

In the evening, as described in the other Troeöt, I completely re-made the brake discs, pads, etc. at the back. Is there anything you can do wrong with the brake cheeks for the hand brake, if you put them in exactly the same way as the old ones? So in the back the elongated U-blech in between. The two cheeks “clamp” with the springs you have to grope in with the pointed tongs. And in the front over the tensioner with the thick spring clamp. The hand brake has no effect :-(. And yes, I found the adjustment option at the front of the lever. However, I have bought several turns, but the lever does not go any further at some point. But the hand brake nevertheless has no effect :-(. I would guess I have put together something wrong, but I have no idea what. Or I cut it to the supplier’s ears? I had bought extra “Brembo”, which according to the statements here is a proper brand. My neighbor (Motocros driver) did not have to confirm it. However, the brake would not have been anything else.