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BMW E90 328i Brake Disc / Pad Info
http://bmwfans.info/parts/catalog/E90/Sedan/USA/328i-N52N/LHD/N/2007/september/browse/
For newer BMW E90s … especially my 2008 328i the front rotor size is 312x24mm and the pads should be sized for such; the rear rotor size is 300x20mm.
http://bmwfans.info/parts/catalog/34116774875/
Stock front rotors have a minimum thickness of 22.8mm, and the rear have a minimum of 18.4mm.