glad your gonna get new discs ,under warranty ? as i said in previous posts its usually disc warpage that causes brake judder (steering shimmy when braking) but i did change a set of ford puma discs today that had a build up of rust on the inner surface causing the judder , they're changing the pads at the same time on yours i hope ?

It's either a brake problem/badly tracked or prehaps one of your alloys is buckled?

Best thing to do is get some new pads/discs on (get the 312mm setup ).

i fixed mine a long time ago now. The pads that the dealership had changed where bigger than the ones on before and caused the inner pads to grate on the part of the disc that wasn't worn. I put on the ones Devenutopia mentioned above. 7k on and they're still problem free