If you want to use mechanical calipers but don't want a one up one down regarding the actuation arm and subsequent cable run on the front of your taddy or rear of your delta get a pair designed for a cheapo Chinese pit bike. £9 the pair and both arms either up or down.
Front + Rear Disc Brake Caliper 47cc 49cc Dirt Mini Pocket Bike Scooter Minimoto | eBay
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