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.
Just the bigger carrier with the bigger rotors on the front. Didn't bother with bigger for the rears. I bought Red Stuff pads.
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.
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?
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.
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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