DBA DBA4784 4000 Series HD Front Brake Disc Rotor

The DBA DBA4784 is a 4000 Series HD front disc brake rotor engineered as a direct, single-piece drop-in replacement for drivers seeking a meaningful upgrade above standard OE braking performance. The HD variant features a smooth OE-style rotor finish, making it well-suited for drivers who want the full engineering benefits of the 4000 Series platform while maintaining a factory appearance — including those in controlled race or competition divisions.

Built from XG150 high-carbon alloyed iron and subjected to DBA's proprietary Thermal Stability Profiling (TSP) process, this rotor is engineered to withstand intense, repeated braking cycles without the heat-related degradation common in standard OE or lesser aftermarket rotors.

Key Features:

• Kangaroo Paw Ventilation: 144 diamond and teardrop patterned internal pillars deliver up to 30% more surface area and 20% improved cooling efficiency versus traditional straight vane designs
• XG150 High-Carbon Alloyed Iron Construction: Premium alloy formulation optimized to work in conjunction with DBA's TSP heat treatment for maximum thermal resilience
• Thermal Stability Profiling (TSP): Increases the rotor's capacity to handle sustained and extreme heat over prolonged heavy-braking periods
• CBN Machine-Turned Finish: Cubic Boron Nitride surface finishing minimizes disc thickness variation, reducing the risk of pad knock and premature wear
• Thermographic Paint Markings: Color-changing paint on non-friction areas changes at specific temperature thresholds to assist with monitoring braking temperatures and rotor fatigue
• Rust-Inhibiting Paint: Applied to all non-friction surfaces to prevent corrosion and maintain appearance
• HD Smooth Finish: OE-style surface for a factory look with upgraded internals — no slots or drill holes
• Direct Replacement Fitment: Sold individually; two required per axle

The DBA4784 is proudly manufactured by Disc Brakes Australia (DBA), an Australian-founded global leader in aftermarket and OE-replacement brake technology with decades of engineering expertise across street, performance, and off-road applications.