DBA DBA42447S 4000 Series T3 Slotted Performance Disc Brake Rotor

The DBA DBA42447S is a 4000 Series T3 bi-directional slotted disc brake rotor engineered for drivers who demand high-performance braking above and beyond standard OE levels. Manufactured by Disc Brakes Australia (DBA), this single-piece direct replacement rotor is built to perform in both demanding street and motorsport applications.

T3 Tri-Symmetrical Slot Design:

• Features DBA's patented T3 bi-directional slot design with precise CNC-machined tri-symmetrical slots, increasing exit points from 32 (T2) to 48 slots
• Tri-symmetrical curved slots dampen vibration harmonics for a quieter, more responsive, and smoother brake pedal feel
• Slots evacuate brake pad friction dust and gases to maintain consistent, effective braking performance with every stop
• Bi-directional design eliminates the need for dedicated left/right rotors — one rotor fits either side

Advanced Materials & Thermal Technology:

• Cast from XG-150 high carbon alloyed iron for superior strength and thermal capacity
• Undergoes DBA's proprietary Thermal Stability Profiling (TSP) process — controlled heat cycling relieves internal casting stresses, maximizing thermal stability and reducing metal fatigue under extreme braking
• Thermographic heat paint markings on the rotor's outer edge change color at specific temperature thresholds, providing a visual indicator for monitoring braking temperatures and rotor fatigue

Kangaroo Paw Ventilation:

• DBA's patented Kangaroo Paw internal vane design features 144 diamond and teardrop-shaped pillars
• Delivers up to a 30% increase in surface area and 20% improvement in cooling efficiency compared to traditional straight-vane designs
• Improved airflow reduces heat buildup during prolonged or aggressive braking

Additional Features:

• Direct bolt-on replacement — no mechanical modifications required
• Non-friction surfaces painted to resist corrosion and enhance appearance
• Made in Australia — DBA rotors are trusted as original equipment on many vehicles worldwide

The DBA 4000 Series T3 is the recommended choice for high-performance street driving, track days, and spirited driving where consistent, fade-resistant braking is essential. Part number suffix (S) denotes the T3 slotted configuration.