Front brakes are always a good thing to have on a enduro kart. Some org.s require 2 master cylinders on separate calipers,I.E. Front and Back. allot of the Tags and Yamaha Sit Ups use only the rear brakes with much success. IMO Your much better and safer with rear and front both. At least when You run something faster then a 4 stroke. Just be sure to check Your rule book and follow it all the way.