front brake discs c63 amg

[gasman2]

Just picked up my 2014 c63 amg and notice the disc face has about a 1/2inch surface rust on outermost lip is it poss my piston isnt full depressing on the brake pads ..preety sure it shd be clean all round the face unless someone knows any different

 

[Bonkers]

Hi, a little late I know. I have read on a forum that the lip is normal. Should be at the top and the bottom of where the pads come into contact with the disc.