DBA DBA42120XS Series XS Cross-Drilled Slotted Disc Brake Rotor - 4000

The DBA DBA42120XS is a 4000 Series XS cross-drilled and slotted disc brake rotor from Disc Brakes Australia (DBA), engineered as a direct-fit, single-piece performance upgrade over standard OE brake rotors. Combining non-directional cross-drilling with precision slotting, this rotor delivers superior heat dissipation and pad bite for demanding street and high-performance driving conditions.

Cast from XG-150 high carbon alloyed iron and subjected to DBA's proprietary Thermal Stability Profiling (TSP) process, the DBA42120XS is built to withstand the intense stress and heat generated under aggressive braking — cycle after cycle. The TSP process subjects the iron to prolonged, controlled heat cycles to relieve internal manufacturing stresses, ensuring maximum thermal stability and reduced metal fatigue.

Key Features:

• 4000 Series XS Design: Non-directional cross-drilled and slotted surface pattern allows both left and right universal fitment, eliminating the need for separate directional rotors
• Kangaroo Paw Vane Ventilation: DBA's patented internal vane design features 144 diamond and teardrop-shaped pillars, delivering up to 30% more surface area and 20% improved cooling efficiency versus traditional straight-vane designs
• XG-150 High Carbon Iron Construction: Reduces vibration and brake noise while providing exceptional durability under repeated thermal cycling
• Thermal Stability Profiling (TSP): Proprietary heat treatment process realigns the iron microstructure, increasing rotor stability, reducing surface cracking, and improving fatigue resistance
• Cross-Drilled & Slotted Surface: Chamfered drill holes and symmetrical slots work together to evacuate brake pad friction dust and gases, delivering a quieter, more responsive pedal feel
• Temperature Indicator Paint: Three heat-sensitive paint markings on the rotor edge change color at specific temperature thresholds, helping monitor braking temperatures and rotor fatigue
• Corrosion-Resistant Finish: Non-friction areas are painted to prevent rust and enhance appearance
• Sold Individually: Replacement as a left-right pair is recommended

The DBA 4000 Series XS is ideally suited for performance street driving and is positioned between DBA's Street Series XS Gold and the 5000 Series XS in terms of performance capability. Note: Cross-drilled configurations are not recommended for heavy off-road or dedicated track day use. The DBA42120XS is backed by DBA's 12-month/12,000-mile warranty against material and craftsmanship defects.