Fillet for bicycle brake block

 From:  Koi
10685.1 
Hey guys,
I got a question: I want to model a biycle brake block as it it on the photo. I think the block was bent. thus a similar principle as one folds a cardboard box.
So I tried to built it in parts. But when I make a fillet for the rounding, its on the full part (red line). is there a way to stop the continuous connection? Or am I doing it the wrong way?

Best regards and thank you so much!

koi
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