Ultima | Rear Drilled & Slotted Brake Disc Rotor (Single) | HSV VT VZ PBR 2 Piston Caliper | AAP049SRUltima Rear Drilled & Slotted Brake Disc Rotor (Single) for HSV VTVZ with PBR 2 Piston Caliper This Ultima Rear Drilled and Slotted Brake Disc Rotor (AAP049SR) is a high performance replacement designed specifically for HSV models (VT, VX, VY, VZ) equipped with the PBR 2 Piston rear brake caliper package. The combination of precision drilling and slotting significantly enhances braking performance by improving initial bite, rapidly dissipating heat,