How can I tell if I can add a front brake to my cruiser? I recently had to give up running and decided to start commuting to/from work (about 15 miles round trip) so I could maintain my cardio fitness. One problem is I like to ride my cruiser (a Masi Soulville) and use that as my commuter. It's a coaster-brake-only setup, and I was wondering how I could tell if it would accept a front brake, and if so, what to look for in said front brake.
To install a front brake you will need to have a fork that will accept the brake caliper.  There are three potential options for this: A standard road caliper (hole through the fork crown), cantilever/ v-brakes ( one post on either side of the fork blade) or a disc mount (bracket at the end of the fork on the non-drive side).
The Masi Soulville should have the first option, a hole drilled through the fork crown for installing a standard road caliper.
You will need to get a road caliper that is intended for use with a flat bar brake lever, as many road calipers are intended for use with drop handlebar levers.