I recommend adding a front brake as soon as possible. A coaster brake generally won't stop you in an a sudden emergency stop, plus if your regular bike chain breaks or jumps off the sprocket....you'll have no brakes at all. Spooky Tooth sells a nice meaty front brake kit that will stop much more quickly than a coaster. Best of luck with your new MB.
Always add a front brake; whatever you can use up front is a HUGE safety advantage in an emergency stop.
Just cruisin' around, yeah, the foot brake is fine but if you need to stop instantly and in a short a distance as possible, you need a front brake.
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In addition to the limitations of a coaster brake, it's the front wheel that will be most efficient in stopping the bike due to the forward weight transfer. In a quick stop, I don't use the rear brake because the wheel will lock up and just slide. I've lifted the rear wheel off the ground more than once, scared myself a few times too.
twin brake for me works the best front and back at the same time cant go wrong ther i know i drive and deliver on my bike every day and drive it 60-80 mils a day belive me it works out just as well as moding it to fit a drum