"Do you know anything about the "no brakes" rule? Will they let us enter if we show up on a brakeless track bike? Or will someone make a big deal out of it? I have a front brake and was considering putting a back brake on just to be on the safe side. I know they want you to have a helmet, but I wasnt sure about brakes."
They cant keep you off the public roads (but then again, they could keep you from the chowing at the stops).
For what its worth, in my experience, noone ever makes a big deal about brakeless bikes, until the rider points out to the world his bike is brakeless. 2 types of riders in the MS rides - out-of-shape warriors who dont know a coaster from a fixed, and the mapai militia who's too into themselves to give someone w/out spandex the time of day. neither group will ever notice your bike.
Personally, the idiots i've seen in these rides, I wouldnt want to ride brakeless.