Join Date: Apr 2002
Location: Montréal (Québec)
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A puncture in the sidewall might be repaired with either a tire boot (for sale at some bike stores) or with tyvec (such as a Fed-Ex envelope), but this is considered a good on-the-road repair and, in 90% of the cases, the tire should be replaced fairly soon.
However, the brake-pad-induced flat is a lengthy cut all along the tire, and while it has ruptured in one spot or probably in one 1-ft-long zone, all the tire is weakened at around the same space. In those cases, I doubt that a Tyvec patch or a tire boot would even last long enough to ride to your LBS.
IOW, replace the tire.
P.S. Been there, done that, with cyclocross tires and centrepull brakes that couldn't be set low enough for fat tires. The solution was to file the top part of the brake pads... something I forgot to do with new pads.