Oops, wrong person.
The A6 2.7TQ comes with 321mm x 30mm Front, 256mm x 10mm Rear. I don't have exact specs, but they will be on the disk, but typically, it would be 28mm, and 8.5mm minimum thickness.
The Audi Brake light comes on either at low fluid, or sensor contact with the disk. If topping off the fluid, turns out the light, great, it will come back on when the pads are low. Low on an Audi typically means at least a couple thousand miles left, and they light should alert her to do something.
Yes, it is a fast, heavy car, but the brakes are reasonably sized, and hold up well on the street.
Any of the vendors in the Quarterly are pretty good. It's all about bottom line price really. I am not convinced any one piece cast rotor is any better than the next, so go cheap. OE, or aftermarket. You may only be able to get OE rears. Many do not have complete web sites, so youhave to use the phone. Sorry, I got no magic bullet here.
Pads are pads. I would go with the Hawk HPSes from Tirerack/Khail, or Geoff.
Sid does a good job on brakes, but I wouldn't let him get the parts. If you want to be completely hands off, send her to SportHaus.
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