Turning off VDC does not turn off ABLS, which is responsible for applying the brakes to the rear wheels when it detects wheel slip. Since you're only experiencing this on the rear brakes, I would guess ABLS is the culprit. I think you have to remove the Stop Lamp fuse to turn it off.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |