Gary O'Neill scored twice as Fingal recorded their first Premier Division victory and in the process condemned Bray to their third straight defeat.
Former Bray striker Eamon Zayed returned to haunt his former club in the 15th minute.
The visitors then doubled their lead eight minutes into the second period. Conan Byrne cut the ball back for Gary O'Neill to lift a close range effort into the roof of the net.
Bray did score in the 75th minute when Shane O'Neill cracked a stunning 22-yard drive past a despairing Brendan Clarke, but O'Neill popped up in the 81st minute to make sure of the points.