The EBC GD1846 is a rear GD Sport dimpled and slotted brake rotor for the Audi A6 quattro 3.0 supercharged (C7 generation, 2012 and later). The manufacturer says GD Sport rotors are machined in the UK from R90-approved blanks, and their wide aperture slots pull cooler air across the pad contact to reduce fade under repeated hard stops. Dimple drilling lets gases escape from under the pad without through-holes, which the manufacturer links to fewer stress cracks. Stock rotors are not built for repeated fast-street or mountain-road braking, so this upgrade targets owners who want more consistent rear bite and a corrosion-resistant finish that holds up to winter road salt. Searches for 2012-2017 Audi A6 3.0T rear sport rotors, EBC GD Sport dimpled slotted rotors, and C7 A6 quattro rear brake upgrade usually lead to this type of rotor.
Each rotor is balanced and runout-inspected before release, according to the manufacturer, which matters when you are replacing rotors on an all-wheel-drive car where a warped disc shows up as pedal pulsation. Owners on user forums typically replace rear rotors and pads together, because worn pads paired with new rotors cause bedding issues and noise. The manufacturer describes GD Sport rotors as a strong choice for fast street cars, so they suit drivers who run performance pads and want heavier braking without the cost of a full big-brake kit.
Owners on user forums report that rear service on the 3.0T requires VCDS or OBD11 software to open the electric parking brake so the caliper piston can be pushed back.
The manufacturer states that dimple drilling provides pad degassing without through-drilled holes, which it associates with rotor cracking.
Owners on user forums advise pumping the brake pedal until firm pressure returns before driving, since the pads need to seat against the new rotor surface.
Rear rotor replacement on this platform is a moderate DIY job rather than a bolt-on swap. Owners on user forums say you need a scan tool (VCDS or OBD11) to retract the electric parking brake motor before the caliper can come off. Rusted rotors often stick to the hub, so plan for penetrating oil, a hammer, and threaded M-sized bolts or grade 8 bolts to press the rotor off. Forum users also recommend a torque wrench for the caliper carrier bolts, and a small hex bit for the caliper hardware. Kit hardware may not be included, so check whether new pins and clips are needed before you start. Disconnect the battery and open the brake fluid reservoir cap to prevent overflow when you push the caliper piston back.
