The first disc brakes (front only)on a production bullet was 2009 according to wiki.
Technically it was the Electra-X, 2004-8 as far as export models were concerned. First RE
factory accessory disc brake kit was offered around 1991, the last home market 500 E/S Iron Barrel Bullets also had them as standard. Other Indian market 350s such as the AVL Thunderbird and Machismo (great name, huh?) were disc brake from 2004/5.
A.