Unless you were asking that they Employ you as a messenger it's not up to them, not that it matters since whether or not they contract you is up to them. Most messenger setups are contract work which means they can't tell you what to ride. If they are the only game in town give it a try, toss a few brakes on and don't use them. If they aren't try the other companies. Many will not hire brakeless unless you have some experience to show though.