Zimmermann rotors are good and the price is good also .
Pros: good price, good rotors
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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.
Pros: original discs available, cheaper than expected
Cons: discs warp easily, no tolerances found
Vehicle:
Volkswagen Phaeton
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.
Pros: hubs corrected, discs no longer warp
Cons: calipers initially blamed, sensitive hubs
Vehicle:
Volkswagen Phaeton
i bought stoptech slotted rotors and stoptech performance street pads for my wife's Odyssey as a way to gauge if they were great for daily use compared to just regular rotors and upgraded pads. I can say that there is a huge difference in preventing fade and stopping power just from that kit alone
Pros: preventing fade, stopping power
Vehicle:
Honda Odyssey
I recently did my brakes 2 weeks ago and very happy with how they came out. StopTech Centric Cryo rotors F & R, Hawk HPS 5.0 Street pads, 034 stainless brake lines.
Pros: happy with outcome
Vehicle:
Volkswagen
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.
Pros: performing very well, reasonable price
Cons: Brembo rotors warped quickly
Vehicle:
Volkswagen Phaeton
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.
Pros: performance as good, less brake dust
Cons: cheaper rotors warp easily
Vehicle:
Volkswagen Phaeton
I've used StopTech rotors in 3 cars so far (95 Camaro Z28, 06 Volvo V70R and 05 Corvette) and simply ordered the OEM equivalent and all worked fine. The Camaro worked better than OEM, the V70R worked about the same (OEM brakes were Bremebo so they were already pretty good) and the Corvette was also about the same (car already had excellent stopping capability.)
Pros: worked fine, better than OEM
Vehicle:
Chevrolet Camaro
When I did my rear brake rotors I did zimmerman but I wish I did the meyle ones that don't rust. The "hub" part in the rear is covered in surface rust.
Cons: hub covered in rust
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.
Cons: scored rear rotors
Vehicle:
Volkswagen Tiguan
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