DBA DBA42108 4000 Series HD Rear Disc Brake Rotor 328mm

The DBA DBA42108 is a 4000 Series HD rear disc brake rotor engineered for drivers who demand performance braking above and beyond standard OE levels. Featuring a smooth OE-style finish, the HD variant delivers all the engineering benefits of the 4000 Series platform while maintaining a factory-correct appearance — making it a popular choice for controlled race divisions and performance street use alike.

Advanced High-Carbon Alloy Construction:

• Cast from XG-150 high carbon alloyed iron for superior strength and heat resistance
• Subjected to DBA's proprietary Thermal Stability Profiling (TSP) process — prolonged heat cycles under controlled conditions to relieve internal stresses and maximize rotor stability
• Engineered to withstand the heat and stress of repeated, intense braking applications

Kangaroo Paw Ventilation Technology:

• Features DBA's patented Kangaroo Paw vane design — 144 diamond and teardrop-patterned pillars for optimized airflow
• Delivers up to a 30% increase in surface area and 20% improvement in cooling efficiency over traditional straight vane designs
• Reduces brake fade and extends pad and rotor service life

HD Variant Features:

• Smooth OE-style rotor finish — ideal for those who need the performance benefits of the 4000 Series with a stock appearance
• Thermographic heat paint markings that change color at specific temperature thresholds to help monitor braking temperatures and rotor fatigue
• Painted non-friction areas to prevent rust and enhance aesthetics
• 328mm rotor diameter, rear axle application, sold individually (two required per vehicle)

The DBA DBA42108 is a direct-fit, single-piece replacement rotor designed to install without modification. Sold as a single unit; two rotors are required for a complete rear axle installation.