The CSV is modified using either Excel or a script. The braking data is guessed from the other channels. My script assumes that braking is occurring when you decelerate at more than a specified rate for longer than a specified time period. It's great for video overlays but not really useful as a data channel.
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how did u guys get the brake data into Racechrono2avi? OBD doesn't read this channel.
The latest version of my script is linked from the official RCnormalise thread.