King of the Hipsters
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
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You don't need a rear brake with a fixed gear bike because your legs can provide as much or more braking force than can a rear brake.
Keep riding fixed and you'll never want to free wheel again.
Get the cheapest Shimano front brake available (Tiagra, I think, about $35 from a bike shop).
With the right brake pads, a cheap dual-pivot Shimano brake will stop you as quickly as the most expensive brakes made, but it will weigh a tiny bit more.