Also, a quick note on how I think regenerative braking should work. I believe in most motor controllers, there are variable regen circuits built in. First stage would be just lifting off the 'gas' pedal with no brake application - this would give a mild level of regen braking, same as engine braking in a petrol driven car. Second stage would be 'just touching' the brake pedal - say operated by the brake light switch. This would increase regen braking, and maybe coupled with a pot on the pedal, increase progressively the more you press the pedal. As the pedal is pressed more, the mechanical (hydraulic) brakes would come into play.
For a light hydraulic brake setup, look at something like Willwood calipers.
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