Bees travelled to Victoria Road occupying pole position, having taken 10 points from their first four matches of the campaign.
But they came away empty-handed on this occasion after Nicke Kabamba turned a low cross into his own net four minutes from time and Brennan felt most of his squad under-performed.
“Dagenham worked their socks off, kept going, got a little bit of luck at the end with the goal, obviously a deflection,” he told the club website.
“The first goal was always going to be important because they’re low on confidence, but as the game kept going on they seemed to grow in confidence.
“I don’t think we reached our levels, maybe that’s down to them stopping us doing that.
“I only think Danny Collinge reached the level that he has been playing at this season so far, everybody else needs to have a good look in the mirror.
“When we set standards like we have we have to adhere to them.”
In a game of few chances, Brennan felt his side could have done much better and felt they missed Callum Stead.
But he gave credit to Daggers for their performance, adding: “Today we had a lack of quality. There was a great chance, [Harry] Pritchard had an unbelievable opportunity one on one with the goalie, he’s got to score really, he’s a good finisher.
“We didn’t really muster up a lot, they didn’t muster up a lot either. They had some efforts from distance.
“The harder they worked the luckier they got in the end, we give them credit, but from the standards we’ve set ourselves, we were way off it.
“Maybe we missed Steady. I didn’t think Nicke had his greatest game, the two centre-halves handled him with ease really.
“I think Steady if we’d put him up there with Nicke maybe could’ve run the channels a bit better, that’s what Steady does.
“No excuses, the best team won the game of football and we’ve just got to move onto the next game.”
Bees return to home soil to host Ebbsfleet United on Bank Holiday Monday and Brennan wants a much better display in front of their own fans.
“I’m gutted for them, they were unbelievable for us today. They were driving us forward,” he said.
“I fear for them a little bit, I don’t think the players did them justice today.
“I don’t want to criticse the players too much but with the standards we’ve set, that’s not good enough today.
“I wouldn’t say I apologise, we’ve just got to move onto the next game and let them get behind us at The Hive.
“We go again Monday, let’s see if we can get on the front foot and get back to the standards we’ve set already.”
Ebbsfleet ran out 3-0 winners over a Kidderminster Harriers side who were reduced to 10 men in the 35th minute.
And Brennan wants to see a response from his players, saying: “We’ve done the preparation on that. I need to watch their game back against Kiddy, but I know they played against 10 men for 60 minutes so that’s good for them.
“But there’s no easy games in our division. Not many teams come here [to Dagenham] and win, the management team know the division.
“We’ve just got to focus, onto the next game, it’s a long season, it is a marathon and hopefully we don’t have too many days like this.”
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