Its a pain at times to find the correct part names. It even seems manufactures use different names for the same parts. I guess different divisions have different names. As for which one is the caliper bolt, not sure how to translate that as in my mind, they are all caliper bolts but maybe this will help.
The front brakes only have four bolts. Two are the guide pins (item 9 below) which requires a 7 mm hex Allen and two are flange bolts (item 5 below).
The guide pins are listed as sliding pins above and are torque to 30Nm. The flange bolts are listed as
brake caliper in steering arm and are torque to 120Nm.
The guide pins allow the floating part of the caliper to move.
The flange bolts mount the caliper bracket (stationary part) to the steering knuckle (another change in name, knuckle and arm).
As to make it more interesting, Volvo calls the Floating part (item 1) the caliper and the stationary part (item 6) the brake caliper bracket. So why not in the torque listing, did it not say, the guide pins to 30Nm and the caliper bracket flange bolts to 120Nm.
Here is a drawing of the parts.
Sorry for the over explanation but maybe it will help,
delhi