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.
Could be the hubs. Mine had an axial throw of 0,02-0,03 mm which I thought wouldn’t affect the discs. I filed a complainment to VW regarding warped discs and they blamed the calipers. Told me one of eight pistons was a bit sluggish. With new calipers and two sets of discs later they found what I had meassured before the complainment, a warped hub. The last pair have not warped after the typical 5000 km mark as before. So at least the floating 365 mm discs are very sensitive regarding straight hubs.
I upgraded slightly by going with GLI brakes front and rear. Did basic Meyle rotors with Akebono ceramic pads. Couldn't be happier.
Just the bigger carrier with the bigger rotors on the front. Didn't bother with bigger for the rears. I bought Red Stuff pads.
I had the same with my GTI 2015 manual, I was braking less because I was using the engine brake a lot. At 8000 km I made a complaint at the dealer, they changed the discs, and suggested that I brake harder
Do both. The stock rotors are pretty garbage and cover your car in iron anyways.
Our rear rotors are garbage. The front seem fine but i can see rust marks for where my pads rest when i park it for the weekend. Im researching our incredibly limited options on rear rotors at the moment.
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.
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