Have any Bike Shop to help you.. ? One out here , near by might..
Problem, is lack of images .. Motor in the hub or the frame?
and you are are 8 posts short of being able to insert pictures, Here, even if you know how..
Delta Upright trikes with 1 wheel in the front can have 2 brakes, to have a disc brake the fork must have the fittings on it to mount it
A wheel with a drum brake hub can retrofit a bike on a fork without the fittings.... bit not if that's where your motor.. is
Have a much better Brake put on the V brake posts .. I likr the German Magura Hydraulic HS 33, 22 or 11..
instructions on how to do this without having to tool anything on the bike.
one of these? No Disc brake fittings Must buy a new Fork
hire a bike shop to sort it out for you... it will not be cheap.
mid drive motor drives just 1 back wheel then front fork can take another brake..
.....