DBA DBA42961 Series HD Solid Disc Brake Rotor - 4000

The DBA DBA42961 is a 4000 Series HD solid disc brake rotor engineered by Disc Brakes Australia (DBA) for drivers seeking a significant upgrade over standard OE braking performance. The HD variant delivers all the hallmark benefits of DBA's 4000 Series platform in a smooth, OE-style rotor finish — making it equally well-suited for everyday performance driving and controlled motorsport divisions where a stock appearance is required.

Constructed from XG-150 high-carbon alloyed iron, this rotor undergoes DBA's proprietary Thermal Stability Profiling (TSP) process — a series of precisely controlled heat treatment cycles that relieve internal casting stresses, realign the iron microstructure, and optimize the rotor's ability to handle extreme and sustained thermal loads without warping or metal fatigue.

Internally, the rotor features DBA's patented Kangaroo Paw vane design — a ventilation system incorporating 144 diamond and teardrop-shaped pillars that deliver up to a 30% increase in surface area and up to a 20% improvement in cooling efficiency compared to conventional straight-vane designs. This advanced airflow technology translates directly into reduced brake fade, lower operating temperatures, and extended rotor and pad life.

DBA also applies Thermo-Graphic Heat Paint (TGHP) markings to the rotor's non-friction areas. These paint indicators change color at specific temperature thresholds, giving drivers and mechanics a visible record of peak braking temperatures — a useful diagnostic tool for pad selection and monitoring rotor health over time.

Key Features:

• 4000 Series HD — smooth OE-style finish with full 4000 Series internal engineering
• Cast from XG-150 high-carbon alloyed iron for superior strength and durability
• Thermal Stability Profiling (TSP) for maximum heat resistance and dimensional stability
• Patented Kangaroo Paw ventilation — up to 30% more surface area, 20% better cooling efficiency
• Thermo-Graphic Heat Paint markings for real-time rotor temperature monitoring
• Painted non-friction areas to prevent corrosion and improve appearance
• Direct OE replacement — no mechanical modifications required for installation
• Manufactured to QS-9000 quality standards
• Solid (non-vented) rotor design

The DBA DBA42961 is a solid-disc, single-piece rotor designed as a direct drop-in replacement. It is an ideal choice for performance-minded drivers who want meaningful braking upgrades without sacrificing fitment precision or a clean, understated look.