Here are my thoughts. I had 2 vee brakes last year and when properly adjusted they worked fine, even from 80km/h to dead stop but they need adjusting almost every day when used with an ebike: pros - cheap easy to change pads and little to go wrong cons - lots of brake fade, need to be replaced often, they leave rubber marks on the rim and can make strange sounds in some conditions and they wear unevenly. Disk brakes pros - less brake fade, less adjustments needed the pads last a long time but I feel you need a heavy duty front fork to cope with the added stress. The older style brakes (horseshoe type) work ok but cannot stop you quickly at ebike speeds they will bend and the pads will wear very quickly, they may be ok for low power kits. The vee brakes worked fine for me. I went though 4 sets of pads in one year but this is over 4000kms of use. I think if your on a tight budget a bike with vee brakes is ok to start with but after only a few miles the limitations of the cheap front fork on most bikes becomes a problem. when you find some extra cash a front fork with disk brakes will give you extra stopping power way more travel, adjustable preload and dampening to adjust to your riding style, less maintanance and a more ridgid and predictable front end this will make your ebike very strong and handle a lot better. I run a cheap $250.00 full suspension bike with a highend front fork, it handles like a dream and with the sealed headset bearings I installed as well as oversized handlebars it feels solid under all conditions and I can stop on a dime now.
