According to the newsletter today, Rock Auto has added Zimmerman to their catalog. They have some for Phaetons if yours has the smaller front rotors.
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 think the ones I just fitted on the front are TRW, they were significantly cheaper than the genuine parts I've previously bought, but the performance is at least as good, with less brake dust. There's a big difference between quality and cheap parts when it comes to brakes, cheaper rotors will be much more likely to warp.
Stop Tech drilled /slotted front rotors , Power Stop evolution carbon fiber/ceramic brake pads ..Raybestos solid rear rotors with Stop Tech ceramic pads (painted calipers n rotor hubs blue)
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.
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.
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