DBA DBA42990XD 4000 Series XD Cross-Drilled Dimpled Front Brake Rotor

The DBA DBA42990XD is a 4000 Series XD front brake rotor engineered as a direct OEM replacement with meaningful performance gains. The XD (Cross-Drilled/Dimpled) finish combines precision cross-drilled holes with strategically placed dimples across the rotor face, delivering superior cooling efficiency, improved pad bite, and a cleaner braking surface with every stop.

Key Features:

• Cross-Drilled & Dimpled (XD) Design: DBA's unique mix of drilled holes and dimples provides enhanced structural integrity over traditional fully cross-drilled rotors, while still promoting heat dissipation and gas/dust expulsion
• XG-150 High Carbon Alloyed Iron: Premium metallurgy engineered to withstand high thermal loads and resist warping under repeated hard braking
• Thermal Stability Profiling (TSP): Heat treatment cycles realign the iron's microstructure, increasing rotor stability and long-term durability
• Kangaroo Paw Ventilation: DBA's patented 144-point diamond and teardrop pillar vane ventilation system maximizes airflow through the rotor for reduced brake fade
• CBN Machine Turned Finish: Cubic Boron Nitride machining minimizes disc thickness variation, reducing the risk of brake shudder and premature pad wear
• Thermo-Graphic Paint Markings (THGP): Heat-sensitive paint on the rotor hub changes color at specific temperature thresholds, providing a quick visual indicator of rotor heat history
• Symmetrical / Bi-Directional Design: Universal left/right fitment eliminates the need for separate handed rotors
• Rust-Inhibiting Coating: Non-friction surfaces are painted to prevent corrosion and maintain appearance
• Direct Replacement Fit: Bolt-on installation with no modifications required — uses factory caliper brackets and hardware

The DBA 4000 Series XD is recommended for performance street driving and light track use, making it an ideal upgrade over stock rotors for drivers seeking improved braking response and a sportier look. Sold as a single rotor.