DBA DBA42688S 4000 Series T3 Slotted Disc Brake Rotor 322mm

The DBA DBA42688S is a 4000 Series T3 Slotted performance disc brake rotor featuring DBA's patented tri-symmetrical slot design. Built on the foundations of DBA's T2 slot pattern, the T3 upgrade delivers 48 precision CNC-machined curved slots — up from 32 in the T2 — maximizing the number of exit points for brake pad friction dust and gases to escape. The result is a quieter, more responsive, and smoother brake pedal feel with exceptional consistency stop after stop. With a rotor diameter of 322mm, this rotor is a direct bolt-on replacement requiring no mechanical modifications.

Key Features:

• T3 Tri-Symmetrical Slot Design: 48 CNC-machined curved slots provide superior gas and friction dust evacuation versus straight-slot or T2 designs
• Kangaroo Paw Ventilation: 144 diamond and teardrop-shaped pillars deliver up to 30% greater surface area and 20% improved cooling efficiency over traditional straight-vane designs
• XG-150 High Carbon Alloy Iron: DBA's proprietary cast iron formulation offers high strength, excellent thermal stability, and natural resistance to heat-induced warping
• Thermal Stability Profiling (TSP): Proprietary heat treatment process aligns the grain structure of the metal at the atomic level, improving rotor stability, durability, and resistance to extreme heat events
• Thermographic Heat Paint Markings: Color-change paint on the outer edge monitors peak braking temperatures and assists with identifying rotor fatigue in demanding conditions
• CBN Machine Turned Finish: Cubic Boron Nitride machining minimizes disc thickness variation, reducing the potential for pad knock and premature wear
• Symmetrical Slot Design: Universal left/right fitment — a single part number covers both sides
• Rust-Resistant Finish: Non-friction surfaces are painted to prevent rust and maintain appearance
• Direct Replacement: Bolt-on fitment with no mechanical changes required

The DBA 4000 Series T3 is the recommended choice for high-performance street driving, track days, and demanding daily use. Manufactured to QS-9000 quality standards using premium-grade materials with a high iron content and dense metal matrix, these rotors deliver long service life and safe, consistent stopping power. The (S) suffix in the part number denotes T3 slotted specification.