A Gary Alexander penalty was not enough for Brentford to record a third straight League One win as they were held to a 1-1 draw by Bury.
The Bees took the lead just past the hour mark and had a man advantage for the final 12 minutes.
But the home side refused to give up and equalised with five minutes remaining to earn a share of the spoils.
Brentford started very brightly - they had much the better of the first 20 minutes and played the opening quarter on the front foot in the Bury half.
Alexander shot over inside the first 20 seconds and then laid a ball into the path of Niall McGinn, who shot wide of the far post.
The home side could not deal with Alexander as Brentford's focus and Marcus Bean breaking from midfield in the early stages.
Cameron Belford in the home goal had to dive full stretch to make a save from a Sam Saunders header and then got down well to keep out a low Bean shot.
Leon Legge headed a couple of efforts wide and Saunders lifted a shot over after another fine burst from Bean.
Richard Lee had to save a bouncing free kick from Peter Sweeney just before the half hour and the home side came more in to the game as half time approached.
A Mike Jones cross-cum-shot flew just wide of the far post, Steven Schumacher had a shot blocked and then sliced an effort that fell for Phil Picken to shoot wide.
But Brentford were still having the better of it - McGinn shot wide after a break forward and Saunders missed the target with a curling free kick.
The last chance of the half was arguably the best, McGinn dragging a shot wide from 19 yards with only Belford to beat
The second half started evenly - Jones brought a low early save out of Lee and then fired wide while at the other end, Saunders curled a free kick down the throat of Belford.
Harlee Dean almost created an opening with a superb run from deep, he weaved past three or four players in to the Bury penalty area but referee Carl Boyeson deemed a fair challenge had stopped him when Brentford thought otherwise.
Niall McGinn picked up the loose ball and lashed it across the box where Joe Skarz almost put it past his own goalkeeper.
Brentford won their penalty on the hour - Jake Bidwell put in a cross from the left that Belford could only palm out, McGinn's shot was blocked and Diagouraga's follow-up effort was cleared but when the ball dropped back to the leggy midfield man, Sweeney brought him down.
Mr Boyeson did point to the spot this time and Alexander placed his penalty in to the top left corner.
Brentford had chances to seal the game soon after - Alexander shot wide on the turn and then forced Efe Sodje in to a vital block while Jonathan Douglas missed the target with a volley.
The home side tried to find a way back in to the game - Lenell John-Lewis had a shot blocked, a Schumacher free kick was deflected wide and David Amoo missed the target with a header.
Lee had to palm away a John-Lewis cross that may have been arrowing in to the top corner and Schumacher blazed well over.
Skarz afternoon was brought to a premature end when he was sent off with 12 minutes to go for a foul on Douglas, his second booking following one for an early foul on Bean.
Belford made a pair of important saves immediately after the red card - tipping a fierce Bean shot over and then saving a Dean header.
And they proved their value when the home side equalised with five minutes left.
Brentford failed to clear a free kick and John-Lewis lashed home a volley that Lee got a hand to but could not keep out.
The Bees went searching for a winner but Bury held the ball well and denied them opportunities.
And when Mr Boyeson brought proceedings to a close, the result was a point apiece.
Bury: Belford; Picken, Eastham, Sodje, Skarz; Amoo, Schumacher, Sweeney, Carrington (sub John-Lewis 64 mins), Jones (sub Worrall 77 mins); Bishop (sub Harrad 84 mins)
Subs (not used): Hughes, Branagan
Bookings: Sodje (7 mins), Skarz (17 mins), Eastham (62 mins)
Sent Off: Skarz (78 mins)
Brentford: Lee; Logan, Legge, Dean, Bidwell; Bean, Douglas, Diagouraga; McGinn (sub Weston 87 mins), Alexander, Saunders (sub Donaldson 77 mins)
Subs (not used): Moore, Eger, Grella
Bookings: Diagouraga (27 mins) (third of season)
Attendance: 4,008 (270 Bees fans)
By Chris Wickham