Thanks for the response. Im thinking 280 was refering to the wheel bearing nut.
On my W210 I found that the bearing adjustment plays a major part in new brake systems. After my brake job I experienced vibration aswell and found that the bearings had been adjusted loosely or just needed attention, causing vibration. Before it didnt and after it did.
Logic dictates unlikely but the more I read the more I realise murphy's law exists. Pack and adjust the bearings(correctly) before you buy anything.