[V8] 4.2 A6 dual piston front break pad replacement

[Eric Langheinrich]

So, it's time to replace the front pads on my A6. Dealer 
wanted over $300 which after having done breaks for years I 
scoffed at. Pulled one of the wheels today and wow what a 
setup. Quite a difference with the dual pistons and all the 
fun tubing makes the front caliper look like something off of 
the space shuttle. 

Digging around to remove the caliper from the car I came 
across my first question and figured I'd see if anyone has 
any advice. 

There are two possible ways the caliper can be handled. There 
is a set of torx (top and bottom) that look like they will 
allow the caliper to be split in two. Then, behind a couple 
of plastic covers where I expected a set of torx there are 
round bolts. Not torx, not hex, just round with a hole that 
is an inch or so deep. These look like the bolts that hold 
the calipers on. 
 
Am I missing something or is the way to handle these to just 
pull the torx splitting the caliper in two? This of course 
will require a lot of break bleeding since the bleeder valve 
will need to be removed to remove the top torx. 
 
What is the deal with the other bolts? I haven't run across 
anything quite like it in my days of working on cars. 
 
Any BTDT advice?
 
Thanks, 
 
Eric