Flashing/caulking when adding something to an outside wall
I have a brick home as well, and when I have changed the dryer vent, added an outside receptacle, or routed my fuel oil lines through the wall, I have simply mortared them in. In the case of the fuel oil fill and vent, I removed one complete brick, routed the lines through, and mortared around them, and painted it a color close to the brick, then, after we switched to propane, I chipped out the mortar, reinstalled the brick, and it looks original again. In the case of receptacles, I have used metal boxes, but rather than tucking the mortar, I finished it flush with the brick, so that when I installed the outdoor cover, the gasket had a flat surface to set against. For small holes, like when I changed the entrance cable and phone line, I punched the hole as close to exact as I could, and sealed it with gray caulk.