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@jwshale
Some front-of-a-sheet-of-paper calculations lead me to believe that the maximum bending stress in the aluminium due to braking (rounding to give a worst case scenario) is about 30MPa. The Aluminium 6082 T6 alloy that I'm using has a yield stress of about 250MPa.
However I could have got that all wrong, in which case I will end up with the brake dislodging from the frame rather suddenly - maybe I should learn to stop quicker with my legs.