DBA DBA42447 Series HD Disc Brake Rotor - 4000

The DBA DBA42447 is a 4000 Series HD disc brake rotor engineered as a direct, single-piece replacement designed to deliver upgraded braking performance beyond standard OEM levels. The HD variant features a smooth OE-style rotor finish, making it popular with drivers who want the performance advantages of the 4000 Series platform while maintaining a factory-correct appearance — including those in controlled motorsport divisions where a clean rotor face is required.

Cast from XG-150 high carbon alloyed iron and subjected to DBA's proprietary Thermal Stability Profiling (TSP) process, this rotor is engineered to withstand the elevated stress and heat generated during intense braking. TSP involves controlled, prolonged heat cycling to relieve internal manufacturing stresses, maximizing thermal stability and minimizing metal fatigue over the life of the rotor.

The DBA42447 features DBA's patented Kangaroo Paw ventilation system — a series of 144 diamond and teardrop-shaped internal pillars that increase internal surface area by up to 30% and improve cooling efficiency by up to 20% compared to traditional straight-vane rotor designs. This enhanced airflow directly reduces operating temperatures, brake fade, rotor stress, and disc thickness variation.

Key Features:

• 4000 Series HD smooth OE-style rotor face — ideal for factory-look builds and restricted race classes
• Cast from XG-150 high carbon alloyed iron for superior heat capacity and wear resistance
• Thermal Stability Profiling (TSP) for maximum dimensional stability under repeated heavy braking
• Patented Kangaroo Paw ventilation — up to 30% more surface area, up to 20% better cooling efficiency vs. straight-vane designs
• Thermo-Graphic paint markings change color at critical temperature thresholds to assist with brake temperature monitoring
• Painted non-friction areas to resist corrosion and maintain appearance
• Direct OEM bolt-on replacement — no modifications required
• Sold individually

The DBA DBA42447 is a high-quality upgrade for drivers seeking improved braking endurance and thermal management with a clean, understated look that mirrors the original equipment rotor.