I have a facelift RS3 that I bought in Sept 2018.
I had the front discs replaced (Feb 2019) at 800 miles (started marking at 250 miles).
One had a ring of corrosion about 1/4" wide around middle of disc.
Had them replaced under warranty.
Don't use the car during winter so only done 1750 miles now but front disc is corroding again. Car is garaged when not being used.
Same thing with a double band of corrosion around middle of disc. Won't clean up with some 'spirited' driving.
Notified them Jan this year.
Audi UK refusing to fix again under warranty as only guaranteed for 6 months/6000 miles and they won't replace same part twice.
They say it is wear and tear.
See a few posts regarding brake squeals and the odd one about rusting and warping.
Any advice to convince Audi UK otherwise?
I will replace them eventually but not just now.