Thats just minor scoring and i'd leave them be, if you end stumping up for new discs by the time you've covered another 800 miles they will be just the same.

Fronts do the lions share of braking so with every application of the brakes any dirt thrown onto the discs or pads gets swept off, the rears do so little work in some cases even common rust build up barely gets cleaned off.

Not part of the question, but this is one of the reasons i'd rather drum rear brakes on standard cars, you can remove drums after 80k miles and find not a single scratch on the friction surfaces.

Edited by gordonbennet on 10/07/2020 at 20:11

They look pretty normal to me. Perhaps a tiny sharp stone responsible for the particularly noticeable gouge. I've just looked at our nine month old 3000 mile Peugeot 2008 discs, and they look much the same - fronts a bit smoother than the rears, although the rear ones don't look as pitted as yours. Perhaps Peugeot specify better quality steel for their discs?