Dumbarton moved closer to safety from relegation in Division One as Falkirk suffered a Scottish Cup semi-final hangover.
Garry Fleming added two to Mark Gilhaney's opener to move Ian Murray's side six points clear of Dunfermline Athletic in the relegation play-off position.
The home side, who came into the game on the back of a dramatic Scottish Cup semi-final loss to Hibernian, slipped to fourth after their first league defeat in five games.
Gilhaney opened the scoring in the 19th minute with a fizzing low drive from the edge of the area.
And Fleming added his first two minutes later when he steered an effort in from close range after a well-worked passing move.
Lyle Taylor pulled a goal back in the 33rd minute by heading in Sean Higgins' cross.
However, Fleming restored the two-goal cushion 20 minutes into the second period with a clinical finish after being sent clear by Gilhaney.
Falkirk: McGovern, Rowan, Flynn, Vaulks, Kingsley, Higgins, Dale Fulton (Sibbald 71), Flannigan, Alston (Weatherston 63), Leahy (Grant 63), Taylor. Subs Not Used: Bowman, Dods.
Booked: Dale Fulton.
Goals: Taylor 33.
Dumbarton: Grindlay, Smith, Graham, Lithgow, Creaney, Agnew, Turner, Fleming (Lamont 88), Gilhaney, Lister, McDougall (Prunty 80). Subs Not Used: Lumsden, Ronald, Horne.
Goals: Gilhaney 19, Fleming 21, 65.
Ref: John McKendrick