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.
Just the bigger carrier with the bigger rotors on the front. Didn't bother with bigger for the rears. I bought Red Stuff pads.
That being said, it would be great to see a basic writeup with pics of the fronts and rears being changed. I ordered and received some new slotted/drilled rotors with ceramic pads. When ordering, I just used the GTI as the model, since it uses the same brake rotors as the TDI, 312mm F, 272mm R - IIRC. If I have time, I will get some pics and write a rudimentary writeup on it. Not sure if I have time/patience to tackle this myself so I may just have my Audi/VW guy do the work (he has many more tools and 2 lifts). In any case, I will try to get some info and pics in here.
Just discussed this last week. I side with my VW dealer on it. They recommend just replacing the rotors, its really not that much more than having them turned, considering you almost guarantee no pulsation, no shimmy or shudder and more even brake wear.
I'm actually running corrado g60 rotors right now that i redrilled to 5 bolt since my last set warped.
have drilled and slotted rotors for it with pads not installed, only problems are it needs the new brakes installed the current ones are warped
BMW OEM rotors after 4 years and 35k miles. Junk build quality now
Imperfections in either the brake rotors or pads making gouge marks in my rotors
Here's a shot of my rear rotors. They both look like this. To quote my service manager "we looked at some other cars and they all look like this, so this looks like normal wear". Not buying it. My b6 passat has 180K miles and those rotors are super smooth.
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