Audi S4 Brake Rotor (1) - Rear - DBA - 4000 Series HD - `04-`09. A direct-replacement rear rotor engineered for drivers who want DBA's proven metallurgy and cooling design with a smooth, OE-style finish.

Cast from XG-150 high carbon alloyed iron and processed with DBA's Thermal Stability Profiling (TSP), this 4000 Series HD rotor is built to withstand repeated heavy braking events. It features DBA's patented Kangaroo Paw ventilation — a pattern of 144 diamond and teardrop pillars — which increases surface area and improves heat dissipation compared to traditional straight-vane rotors. The HD variant keeps a plain, smooth face favored in controlled race divisions or for owners preferring a stock look while still gaining improved thermal performance and corrosion-protective packaging.

Features

• XG-150 high carbon alloyed iron construction
• Thermal Stability Profiling (TSP) for consistent metallurgy
• Kangaroo Paw ventilation (144 diamond/teardrop pillars) for greater surface area and improved cooling
• 4000 Series HD smooth OE-style finish
• Thermo-graphic paint markings (THGP), moisture-proof corrosion protection packaging
• Direct replacement fit for 2004–2009 Audi S4 rear

If you have questions about fitment, braking feel, or whether this rotor suits your driving needs, give us a call. We offer installation and customization services at both our Austin, Texas and Los Angeles, California area locations. 512-982-9393 (TX) or 562-981-6800 (CA).

If you are considering purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov