Hrm. So, pump cars are normally fixies -- you brake them by simply slowing down the speed at which the handle moves; much simpler. Alternately, instead of having the whole pillar move, add a joint to the handle so that while the two sides are still fixed for the pumping motion, one side can swing back and forth, and use cable steering.
If you did actually need brakes, I think you'd be right, but I don't think you do, and I think this would end up looking a lot closer to an actual pumpcar.
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If you did actually need brakes, I think you'd be right, but I don't think you do, and I think this would end up looking a lot closer to an actual pumpcar.