DBA DBA4055XS 4000 Series XS Cross-Drilled & Slotted Front Brake Rotor

The DBA DBA4055XS is a 4000 Series XS cross-drilled and slotted front disc brake rotor engineered as a direct replacement performance upgrade. Designed specifically for HSV models equipped with 4-piston Harrop front calipers (343mm), this rotor delivers improved heat management, shorter stopping distances, and enhanced braking consistency over the factory disc.

Built from XG-150 high carbon alloyed iron and treated with DBA's proprietary Thermal Stability Profiling (TSP) process, the rotor undergoes controlled heat cycling to relieve internal casting stresses—resulting in superior thermal stability, reduced metal fatigue, and long-term durability under demanding conditions.

Key Features:

• XS Cross-Drilled & Slotted Design: Non-directional pattern increases exit points for brake pad friction dust and gases, delivering stronger, more consistent braking bite
• Kangaroo Paw Ventilation: DBA's patented internal vane system uses 144 diamond and teardrop-shaped pillars for up to 20% better heat dissipation versus conventional straight-vane designs
• Thermal Stability Profiling (TSP): Proprietary heat treatment process eliminates internal casting stresses for maximum rotor stability and reduced brake fade
• XG-150 High Carbon Iron: Premium iron alloy formulation optimized for high-performance and high-heat braking applications
• Thermo-Graphic Heat Paint: Color-changing paint markings on non-friction surfaces indicate peak rotor temperatures for easy brake health monitoring
• Non-Directional Pattern: Symmetrical cross-drill and slot layout allows universal left/right fitment—no separate part numbers required per side
• Corrosion-Resistant Finish: Protective paint on all non-friction surfaces prevents rust and enhances appearance
• Rotor Dimensions: 343mm (13.50 in) OD × 32mm (1.26 in) thick
• Warranty: 12-month / 12,000-mile limited warranty (original purchaser)

Important Application Note: The DBA4055XS is designed exclusively for HSV models fitted with 4-piston Harrop front calipers (343mm). It is not compatible with standard Holden Commodore applications or HSV variants equipped with 2-piston calipers. Verify your caliper type before ordering.