The only thing I have done to it before the most recent work was to change out the rotors and pads.
Stock rotors are cheap and effective anything bigger is just for show.
GTI Clubsport rotors drop 2.2lbs per side at the front
FWIW, I recently replaced my front rotors and pads at 40k and I have about 8mm on the back. At this rate, I'll probably have to replace the backs around the same time I do the fronts again. My rotors look nothing like yours though. Mine are smooth and no grooves.
I had the impression that those discs wouldn’t warp as easy as one piece discs but it looks as I was wrong. VW tried to machine my warped discs with them mounted on the car at one point but they failed so badly that they did not even want to show me the result. After that they messured the runout on new discs on the bench and found them OK. After the discs were mounted on the hubs they were messured again and that one of them had warped. That was the way they found the bad hub. I was quite surprised when I was told that VW did not have any tolerances for the runout on the hubs or the discs. I took for granted that they had quite strict tolerances both on the hubs and the discs. I don’t know if the eight piston caliper and the setup with opposed pistons makes the whole system more sensitive to warpage or not but that has been suggested. And to get this a bit more connected to the thread subject I can add that I have not found any alternative to VW original 365 mm floating discs at all. I was quite surprised to find them cheaper than the one piece 334 mm discs to my Passat W8 though.
My Golf R's brakes look like this as well. I have 10K + miles on them but they have been like this since 2-3K miles. I'll say it's "normal". Even though i haven't experienced it with other cars that i can recall.
Eventually it was deemed that the brake discs had become faulty, giving a vibration on braking and there was high speed vibration caused by unbalanced tyres. Front discs replaced, braking vibration gone.
Brought mine into dealership, the service advisor said they manufacture these rotors out of softer material now so they don't warp down the road. The softer material downside is that they wear faster. I don't believe that at all. If they wear faster, wouldn't it be more even wear and not scored lines in there??
I looked at my wife’s Tig and they look bad as well only 3900 miles.
I took a look at my breaks and noticed the exact same wear on passenger front. Have SEL-P 4Motion R-Line and only 1100 miles.
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