He struck five birdies in a bogey-free round to prime him for a challenge at the title.
No one was expecting the course record to be broken as soon as it was but unheralded Gore golfer Scott Hellier provided one of the great rounds of golf.
The world 1643rd ranked amateur hit 12 birdies to end with a sublime 60, smashing Brown and Garner's record by seven shots.
The round bumped Hellier up 42 places to hold the lead by one stroke at eight-under.
However his second round wasn't as smooth as he wanted it to be.
Brown mixed three birdies with seven bogeys to go round in 76, putting him one-under for the tournament.
He will start the third round seven shots off Hellier's pace.