WELCOME AND CONGRATS. I concur with what JCL said. You can get away with re-using the rotors, but when I did mine this way after my X was out of the maintenance terms, everything was fine for a few thousand miles, then I got a shimmy and shake and ended up being the rotors. Only way i found out was when I took them off, took it to my fathers machine shop, placed the rotor on a hardinge turret lathe with a dial indicator, spun the rotor at 300 rpm and the needed jumped around like crazy. I guess when the dealer did it, they just changed the pads, so really they were being used 3 times. With the reduced thickness, there is more of a chance to have the rotors warp. if I were you, i'd just go to ECS tuning, get a brake kit and re-do the entire system, this way you know you are starting fresh. Then when it comes time to do the brakes again, you can use them a second time usually without a problem.

Also, just for fun, the shop has a NDT, or non-destructive testing/magnetic particle testing machine. Hooks that sum-biotch up, hit the go button and HELLO! 3 splash cracks along the rotor surface. Yeah that rotor was shot. I have fun at his shop, haha./

__________________

2011 E70 50i M Sport