DBA DBA42389S 4000 Series T3 Slotted Performance Brake Rotor

The DBA DBA42389S is a 4000 Series T3 Slotted Brake Rotor from Disc Brakes Australia — a direct-replacement, single-piece performance upgrade engineered for drivers who demand more than stock braking capability. Cast from XG-150 high carbon alloyed iron and processed through DBA's proprietary Thermal Stability Profiling (TSP) heat treatment, this rotor is built to withstand intense braking stress time and time again.

Patented T3 Bi-Directional Slot Design:

• Features 48 CNC-machined tri-symmetrical curved slots — an upgrade over the 32 slots found on the T2 design
• Slots provide additional exit points for brake pad friction dust and gases, improving braking consistency and effectiveness
• Bi-directional (symmetrical) slot pattern allows universal left/right fitment — no separate part needed per side
• Curved slot geometry dampens vibration harmonics for a quieter, smoother pedal feel compared to straight-slot designs

Kangaroo Paw Vane Technology:

• 144 diamond and teardrop-shaped pillar vanes replace conventional straight cooling vanes
• Delivers up to a 30% increase in surface area and up to 20% improvement in cooling efficiency
• Center-split core castings enhance heat transfer and overall thermal efficiency

Premium Manufacturing & Finish:

• CBN (Cubic Boron Nitride) machine-turned friction surface minimizes disc thickness variation and reduces the potential for pad knock and premature wear
• Thermo-Graphic paint markings on the rotor edge change color at specific temperature thresholds to assist with monitoring braking temperatures and rotor fatigue
• Non-friction areas are painted to resist rust and maintain appearance
• Manufactured to QS-9000 quality standards using premium-grade materials

The DBA 4000 Series T3 is ideally suited for high-performance street driving, track use, and demanding applications such as towing or heavily laden vehicles. Sold individually — order two for a complete axle set.