I have an 08 m5, when driving at highway speeds (60 - 80 mph) and brake firmly (not jamming on the brakes) i feel a shimey in the steering wheel . any ideas on what causes this? struts, suspension components, rotors? any and all feedback will be greatly appreciated.

 

Almost certainly discs (rotors)

 

thanks nick, will look into it

 

Agreed. 'Pretty std stuff.