It's not going to be a braking coding issue.
It will be a throttle safety coding/tuning problem. On the 135's we have an option we have to turn off to do good power braking burnouts. You'll be fine with a small brake press but once brake pressure passes some point, and I don't know what that point is, the computer kills the throttle. It's a safety measure, think Toyota and the 'unintended acceleration' debacle. Every electronic throttle vehicle has something similar now.
So you'll have to look through the Brake computer and the DME to get it working best for you IMO.
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