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The Campagnolo cable pull mean it end up pulling too much cable to engage the brakes sometime.
Also there can be fault with mechanical brakes as in the way the pads sit in the piston, if they're not 100% straight, they will be spongy no matter what, this go for nearly all the cable operated brakes, such as the Haye, the Spyres, right down to the entry level Promax.
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Personally, a BB7 work better as you're able to dial in the moving pads in without adjusting the cable and losing the mechanical advantage, I liked BB5 but I find I have to try and move the moving pads as close to the rotor by moving the whole calipers so I can keep the arm open as much as I can and just move the static pads closer.
Too little too late. Single Bb7 on order. Should be there before the weekend, leaving on Tuesday very early for a tour Zadar-Ancona-Firenze-Tuscany-Venice just in time to tinker and set up.