Darlington climbed back into the promotion places after three second half goals inflicted a third straight defeat on mid-table Brentford.
Guylain Ndumbu-Nsungu turned in Ryan Valentine's right-wing cross for the first before Julian Joachim scored a superb second from 20 yards.
Bees substitute Rueben Reid scored his side's first goal in nearly three games from close range to give them hope.
But Pawel Abbott sealed it after Ben Hamer dropped Neil Wainwright's cross.
Darlington: Stockdale, Valentine, Foster, Miller, Parker, Hodge (Wainwright 80), Cummins, Kennedy, Joachim, Gall (Blundell 73), Ndumbu-Nsungu (Abbott 63).
Subs Not Used: Kazimierczak, Wiseman.
Goals: Ndumbu-Nsungu 48, Joachim 59, Abbott 90.
Brentford: Hamer, Pead, Sankofa, Osborne, Dickson, Poole,
Smith, Milsom (Mousinho 76), Wayne Brown (Shakes 66), Connell,
Elder (Reid 66).
Subs Not Used: Simon Brown, Charles.
Goals: Reid 82.
Ref: David Foster (Tyne & Wear).