In my experience with the Nitto m12 rack, the special bolts prevent the brackets on the rack from tightening against the cantilever brake arms so tight that the brake doesn't pivot. The $15 bolts, while intuitively do reduce mechanical advantage (although the m12 struts are somewhat pliable), allow the both the brakes and the rack to be cranked down snugly without choking the brake arm movements. I have have an M12 attached to modern cantilever brakes (Tecktro cr720, and/ or Shimano BR550) that requires fancy bolts and another one attached to some old Mafacs that still pivot well with the stock bolts. I can't imagine the brake actually coming loose without the special nuts unless you were purposely leaving the stock bolts loose to prevent the brake arms from getting pinched. Regardless, the double ended bolts make for a clean install- especially with some acorn nuts covering up the ends.
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