DBA DBA42791S 4000 Series T3 Slotted Rear Brake Rotor 348mm

The DBA DBA42791S 4000 Series T3 Slotted Brake Rotor is a premium single-piece, direct-replacement performance rear brake rotor engineered for drivers who demand upgraded stopping power above and beyond stock OE levels. Featuring DBA's patented T3 bi-directional slot design, this 348mm rotor delivers a quieter, more responsive, and smoother brake pedal feel in both high-performance street and heavy-duty off-road applications.

T3 Tri-Symmetrical Slot Design:

• Builds on DBA's proven T2 slot with additional CNC-machined tri-symmetrical slots — increasing from 32 slots (T2) to 48 slots (T3) per rotor
• Bi-directional slot pattern eliminates the need for directional rotors, allowing universal left/right fitment
• Multiplied exit points efficiently evacuate brake pad friction dust and gases, increasing braking consistency and effectiveness with every stop
• Slots continuously de-glaze brake pad surfaces, improving efficiency and preventing rotor scoring

Advanced Metallurgy & Construction:

• Cast from XG-150 high carbon alloyed iron for superior strength, thermal capacity, and thermal stability
• Patented Kangaroo Paw pillar vane venting features 144 diamond and teardrop-shaped pillars for enhanced cooling efficiency — up to 20% better than conventional rotor designs
• Center-split core castings improve heat transfer and thermal efficiency
• Thermal Stability Profiling (TSP) heat treatment realigns the iron's microstructure, increasing rotor stability and durability under intense braking loads
• CBN (Cubic Boron Nitride) machine-turned finish minimizes disc thickness variation, reducing the potential for pad knock and premature wear

Monitoring & Protection:

• Thermo-Graphic paint markings on the rotor's outer edge change color at specific temperature thresholds to help monitor core braking temperatures and rotor fatigue
• Painted non-friction areas resist rust and enhance appearance over the rotor's lifespan

Sold individually. Two rotors required per vehicle axle. DBA recommends the T3 slot design for high-performance and heavy off-road applications. DBA provides a limited warranty to the original purchaser for 12 months or 12,000 miles, whichever occurs first.