I have a 2006 A4 2.0T Quattro auto. with Premium package (17" wheels).

Can someone tell me the rotor size for both front and back? My stock brake pads squeal like crazy - started at 7,000 miles and are still squealing away at 16,000 miles - so I'm looking for a quieter replacement. I assume knowing my rotor size will help me to know which pads are compatible (?)

You're still under warranty, unless pads aren't included anymore.
There is an anti-squealing material that can be smeared on the
backing plates for the pads.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium

Thanks Crazyhawk. I've had the brakes checked by my dealer 2 or 3 times already. They say it's "normal" because of the material of the pads and have supposedly done everything they can to reduce the squeal. I've had enough so I'm just going to pick out some low noise pads and have them installed. Just want to make sure I pick out the compatible pads. Is rotor size the key?

No, the pads must fit the caliper.

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2001 A4 1.8T Q Casablanca White, Tip, ESP, Xenon and Premium