How do you deal with reaching the maximum pressure of the accumulator? Presumably you'd vent to a low-pressure supply, but I think your ability to slow would be affected. I would consider keeping friction brakes (perhaps just on the front wheels) as a backup.
Neat ideas. I'm looking forward to seeing how they work in the real world!! Major major kudos for having the ideas, and then following through by building something based on them!!!
-soD
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