Does a 2011 q7 has to go to the dealer for brake changes?
Not sure where you heard that from. Any good mechanic can change your brake pads and rotors. Just make sure that they use the OEM parts, or source good OE brand for the parts.
An Audi specialist is a good idea- look for an independent garage that has gold plated ashtrays in the waiting room and the service writer is called a "consultant" and is wearing a Rolex- if he speaks German, you've found the right place- now cross his palm with silver- maybe they will let you speak with Hans, the technician in the back
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