Last year I inquired with the great Ron Kimball of Powertech on getting front brake parts for our 1974 VT-8. He told me he did not have any and not to bother adding them to our bike as the front brakes on the Super Broncs were pretty much worthless. I asked him why and he went on to say that there was just way too little surface area of brake shoes for the size of the tire/wheel and weight of the bike. The only reason they offered it as an option was for those individuals who were trying to get their bikes street legal, where both front and rear brakes were required.
Michael