DBA DBA5718.1S Series Slotted Brake Disc Ring Two-Piece Replacement - 5000 T3 323mm

The DBA DBA5718.1S is a 5000 Series T3 slotted brake disc ring — the replacement outer friction ring designed for DBA's two-piece composite brake rotor system. Measuring 323mm in diameter, this disc ring pairs with an existing DBA 5000 Series aluminum hat, allowing drivers to replace only the worn friction surface without replacing the entire rotor assembly.

Built from XG-150 high-carbon cast iron alloy, the disc ring undergoes DBA's proprietary Thermal Stability Profiling (TSP) process — a controlled heat cycling treatment that relieves internal manufacturing stresses at the grain structure level, producing a uniform material for maximum thermal stability and improved fatigue resistance under sustained heavy braking.

T3 Slot Technology:

• Patented bi-directional, tri-symmetrical CNC machined slot design — no left/right rotor designation required
• Increases out-gassing exit points to efficiently clear brake pad friction dust and gases from the rotor surface
• Reduces pad glazing, pad knock-back, and heat-related brake fade
• Quieter operation compared to straight-slot designs, with improved pedal feel and brake response

5000 Series Two-Piece System Benefits:

• Designed to mate with DBA 5000 Series aerospace-grade T6061-T6 aluminum hats secured with National Aerospace Standards (NAS) bolts and crimp nuts
• Allows uniform radial disc expansion as temperatures rise, maintaining rotor integrity under extreme conditions
• Aluminum hat design reduces heat transfer from disc to hub, protecting wheel bearings and hub components
• Reduces unsprung weight compared to traditional one-piece rotor designs
• Cost-effective service solution — reuse your existing DBA 5000 Series hat and replace only the disc ring

DBA Thermo-Graphic Heat Paint (TGHP) markings are included as a standard feature, with color-coded indicators that change at specific temperature thresholds to help monitor peak rotor temperatures and guide brake pad selection.

DBA recommends the 5000 Series T3 for high-performance street vehicles, track day and club racing, and rally applications. Disc Brakes Australia (DBA) is an award-winning brake manufacturer with over four decades of engineering experience and a global reputation for precision disc rotor design.