VY S2 calais LS1 I have an issue where the steering wheel shudders when braking. it doesn't happen all the time and does it at varying speeds. but mainly at the same places on the road. Ie. pulling into driveway I haven't had an issue with any other cars braking there. I did replace all brake pads with ac delco ones not long ago and both rear rotors (holden ones) as I was a little slow on the pad change and scuffed up 1 rotor It looks like the rotors had been replaced at some stage before my ownership as there was basically very little wear on them. The front disc's feel smooth and not rippley or warped or anything. could it be worn steering knuckles or.....?