DBA DBA42635 4000 Series HD Front Disc Brake Rotor Pair

The DBA DBA42635 is a pair of 4000 Series HD front disc brake rotors engineered by Disc Brakes Australia (DBA) as a direct-fit, performance-grade upgrade over standard OEM rotors. With a smooth OE-style finish, the 4000 Series HD variant delivers all the engineering advantages of DBA's renowned 4000 Series platform while maintaining a factory appearance — making it an ideal choice for drivers who want upgraded braking performance without the aggressive look of slotted or drilled designs.

XG-150 High Carbon Iron Construction: Each rotor is cast from DBA's proprietary XG-150 high carbon alloyed iron and then subjected to their exclusive Thermal Stability Profiling (TSP) process — a series of controlled heat treatment cycles designed to relieve internal manufacturing stresses, realign the iron's microstructure, and maximize thermal stability under demanding braking conditions.

Patented Kangaroo Paw Ventilation: At the core of the DBA42635 is DBA's patented Kangaroo Paw vane system — a series of 144 diamond and teardrop-shaped pillars that replace the conventional straight vane design. This unique geometry delivers up to a 30% increase in ventilation surface area and up to a 20% improvement in cooling efficiency, keeping brake temperatures in check during hard stops and extended use.

Cubic Boron Nitriding (CBN) Surface Finish: The final machining step employs Cubic Boron Nitriding, a precision refining process that produces a surface finish far superior to conventionally ground rotors — promoting faster, more even pad bed-in and reducing premature pad wear.

Key Features:

• Sold as a pair (front axle set)
• 4000 Series HD — smooth OE-style finish, suitable for controlled race divisions and daily driving
• Cast from proprietary XG-150 high carbon alloyed iron for superior strength and thermal capacity
• Thermal Stability Profiling (TSP) heat treatment for maximum durability and reduced metal fatigue
• Patented Kangaroo Paw ventilation: 144 diamond and teardrop pillars for up to 30% more surface area
• Up to 20% better cooling efficiency vs. traditional straight vane designs
• CBN-machined friction surface for a superior, consistent finish
• Painted non-friction areas to resist rust and enhance appearance
• Direct OEM replacement — no modifications required for installation

The DBA DBA42635 is the ideal brake rotor upgrade for drivers demanding more from their braking system without sacrificing an OE-style appearance. Pair with DBA performance brake pads for a complete, optimized brake system.