Personally, all three of the motorized bikes I've built had only rear coaster brakes. Not the best set up, however, I do live waaaay out in the boonies and don't have a lot of riding where I couldn't just coast to a stop.

I realize a lot of you ride in the city or more congested areas where good brakes are more than just a good idea.

I'll be the first to admit I know nothing about bike brakes except the cable pull type and some of the variations of those, and coaster brakes.

Pad types?
Brake types?
Disc?

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If it ain't broke, and you mess with it long enough, it will be.