?? Not sure thats correct, I believe the bolts holding the caliper to the hub are only specced to be at 100Nm, well within range of a "standard" torque wrench.
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I think its the caliper carrier bolts that are 275nm not the small M8? caliper slider bolts.
Sorry I can't give you anything definitive about the rotors, soon after I installed them the car developed brake judder (shudder), I initially blamed (suspected) the rotors and because I was running very short of time before we left for a trip to Western Australia I simply had the original rotors machined and put them back in with another set of new pads. Sadly the same thing happened after a few thousand kms, the brakes developed judder hence I have to conclude that the problem was caused by my poor choice of brake pads, plural. I wanted a better performing rotor/pad combination than OE and have basically failed against a number of criteria. I have not been able to get back to sorting through it and trying the next combination which will be back to the Delios rotors and maybe the akebono pads or just OE.
Having said all that, I think the rotors are fine, I did talk to the guys at Delios when I was having problems and they were helpful but not to the extent that they could recommend a pad, which I think is a bit strange especially since I recall discussing pads with them before I bought the rotors. That was a while ago and I could be mistaken, certainly won't be the first time.
Current pads seem to leave deposits on the rotors if you are a light braker (me) and so have to stand on them every so often to clean them up, it's a pita, and overall performance is not the improvement I was hoping for.
This also falls under the "I should know better" because I was involved in brake testing many years ago and I know first hand just how much trial and error goes into OEM selection of pads.
Have fun with that.