Safety Wiring the caliper bolts
Safety wire is used to secure bolts in place and keep them from backing out. Essentially, the wire puts the bolt head under a little constant tension by pulling the bolt head in the tightening direction. It's sort of like a mechanical version of thread-locker. It's used a lot in aviation on fasteners that are exposed to a lot of shock and vibration - and a failure would be more spectacular - but this is the first time I'd seen it on a regular road car.
Oh, yeah, use gloves and goggles - that wire will slice flesh at the first opportunity.
Now all that's left for the brakes is the installation of the hard lines.