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.
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 replaced mine two years ago, both rotors and pads front and rear, with VW parts purchased from VWpartsvortex. As I recall, they were not Brembo, probably ATE. I spent a total of $718 on the set, which seemed reasonable considering the rotor size and how long they last. So far, the new ones are performing very well. As an aside, a few years ago I replaced the rotors with Brembos on a Subaru and was disappointed: the front ones warped almost immediately. The bottom line, I'm afraid, is that it is no longer enough to rely on the brand, especially if sourced on the secondary market. At least with "VW" marked parts the reputation of the vehicle manufacturer is on the line, though even that may not be enough to ensure high quality.
I'll add that I have used ATE rotors with this coating before on the car before my current daily driver and have had good results here in the rust belt. That's why I bought from them again 4,000 miles ago for new fronts on my current car. As with anything, your mileage may vary. I'm sure one could do much worse or much better for daily driver front brake rotors.
Mine are 288 fronts (yeah, I measured) and combined with the pitiful rears the whole systems is not (as I've read many times) "sufficient for daily driving". Too many times I've worried I won't stop in time. Too many times I've come down an average hill with definite fade that made me worry should an animal dart out in front of me. I want something akin to my GTI's brakes. Not something that will stop a freight train but just something I know will stop. And stop firm every time. Definitely OEM . I'd rather not have red but whatever I have, it will have to match front/rear. After reading the limited information I can find across multiple forums, nothing has mentioned swapping the front TDI brakes (if they are actually 310mm) over to a 2.5l. It would seem that if the caliper is the same 2.5 to TDI, all you would really need is the rotor and the TDI carrier, correct? Regarding the rears, nothing seems available straight off the OEM shelf, except GTI, correct? Any non-red options there?
This problem started after I changed the rear VW brakes rotors and rear VW pads and changed all four wheels with remanufactured VW Phaeton wheels.
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.
Just noticed yesterday my front rotors are pretty scored too - got a screw in my tire and the repair shop commented on the rotors too.
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