Well, I don't know how your brakes are set up, but every set of disks I have ever worked on have the hub-centric brake disk securely clamped between the wheel and hub when the wheel lug nuts are secured. Any disk attaching bolts (IF any) were there primarily to keep the disk secure while the wheel is off, and sometimes to provide a bit of additional positioning accuracy, to keep the disk from shifting while mounting the wheel.

Steve