The Break Machine is an enemy in Crisis Core -Final Fantasy VII- that appears in the Shinra Machines Unit of the Special Operations Arms Laboratory.
The best strategy is to make sure Zack is equipped with an accessory that will guard against Break Machine's Instant Death attack. Gravity does not work against this foe, so one should use Costly Punch to inflict significant damage. High-level magic, such as Flare or Quake, will be useful as well. Another useful strategy is to Doublecast Energy. This causes a large amount of damage while avoiding its Instant Death attack.