Brentford slipped to an opening day defeat at a sodden Gigg Lane after Bury hit-man Andy Bishop scored the only goal of the game late in the first half.
Brentford had started brightly and could have been ahead early on but the hosts battled back and scored when they had the initiative - two minutes before the break.
Bishop created it out of nothing, picking up a Michael Jones pass and creating a yard of space inside the penalty area before unleashing a vicious shot which flew past Ben Hamer and into the bottom corner.
And once the hosts got ahead they used their experience to limit Brentford to half chances and take all three points.
It could have been different if Marcus Bean had marked his Brentford debut with a goal inside the first 45 seconds but he was under pressure as he met a Glenn Poole cut back and Wayne Brown was able to save.
Alan Connell had a decent chance minutes later when he met a Marvin Williams cross on the volley but Brown saved again and Nathan Elder had a shot blocked as Brentford started brightly.
But Bury soon found their feet and began to dominate the midfield; Hamer had to stretch to keep out a low Elliott Bennett cross-cum-shot before Bishop lofted an effort just over the bar.
The first twenty minutes were a fine advert for the division with chances continuing to come at both ends, Elder headed straight at Brown before Paul Scott headed wide from close range after Brentford had failed to deal with a Jones cross.
Brian Barry-Murphy had a shot deflected wide, Ben Futcher headed narrowly off target and Jones pulled a shot wide after intercepting a Kevin O'Connor pass.
Brentford could have edged ahead towards the end of the first half when Brown dropped an O'Connor corner but Elder's effort was weak and Bury cleared.
Brown saved a low Poole effort as half time approached and Bury made sure they went into the break happier when Bishop made the telling contribution of the first 45 minutes.
Brentford came out after the break determined to gain control of the match and the midfield in particular and although they managed to gain the upper hand they didn't create many clear cut openings.
David Buchanan produced a fine late clearance as Williams was set to pounce at the far post and Elder headed over soon after but Bury were always a danger on the break.
Hamer had to save well when Bennett tried to pick out Bishop as the hosts sprung forward and the home side should have wrapped the game up with 20 minutes left.
Bennett was again the architect with a fine through ball to release Glynn Hurst who sprung the offside trap; with only Hamer to beat he curled the ball past the Brentford stopper but against the post.
Hamer saved well from Jones but the visitors finished the better - Brown saved a fierce low Connell drive before Poole and O'Connor missed late chances, both firing over from similar positions 16 yards out.
The Bees threw bodies forward in search of an equaliser but could not find one and ended the day frustrated and beaten.
Bury: Brown; Scott (sub Cresswell 90 mins), Sodje, Futcher, Buchanan; Bennett, Barry-Murphy, Dawson, Jones (sub Racchi 90 mins); Hurst (sub Baker 84 mins), Bishop
Subs (not used): Belford, Rouse
Brentford: Hamer; Newton, Osborne, Bennett, Wood (sub Johnson 73 mins); Williams (sub Ademola 76 mins), Bean, O'Connor, Poole; Connell, Elder
Subs (not used): Brown, Wilson, Artus
Attendance: 2819 (393 Bees fans)
Written by Chris Wickham