DBA DBA42851 Series HD Plain Brake Disc Rotor - 4000 Rear

The DBA DBA42851 is a 4000 Series HD plain brake disc rotor designed as a direct-fit rear replacement, delivering a meaningful upgrade in braking performance over standard OE rotors. The HD variant features a smooth, OE-style rotor finish — making it ideal for drivers who want the performance advantages of the 4000 Series while maintaining a clean, stock appearance, such as those in controlled race divisions or concours-style builds.

Key Features:

• XG-150 High Carbon Alloyed Iron Construction: Cast from premium high-carbon alloyed iron for superior strength, heat tolerance, and resistance to wear and fade under demanding braking conditions
• Thermal Stability Profiling (TSP): DBA's proprietary metallurgical process increases the rotor's capacity to handle sustained and extreme heat, improving consistency under repeated heavy braking
• Kangaroo Paw Ventilation: DBA's patented internal vane design featuring 144 diamond and teardrop-shaped pillars delivers up to a 30% increase in surface area and up to 20% improvement in cooling efficiency compared to traditional straight-vane designs
• CBN Machine-Turned Finish: Cubic Boron Nitride precision machining minimizes disc thickness variation, reducing the potential for pad knock and premature wear
• Smooth HD Plain Surface: OE-style rotor face provides consistent, quiet braking and is compatible with a wide range of brake pad compounds
• Rust-Resistant Coating: Non-friction areas are painted to prevent corrosion and enhance overall appearance
• Temperature Indicator Markings: Color-changing paint markings alert to specific temperature thresholds, helping monitor rotor fatigue and braking heat
• Direct Replacement Fitment: Single-piece design engineered for straightforward installation with no modifications required

The DBA 4000 Series HD is a trusted choice for enthusiast drivers, daily performance use, and controlled motorsport divisions seeking a proven upgrade over factory braking without altering rotor appearance. Sold individually — order two for a complete axle replacement.