Bready clinched the Sammy Jeffrey Shield in dramatic circumstances, with Ian Young's dismissal of Patrick Carson from what proved to be the last ball of the game tilting the match in the Magheramason side's favour when the DLS sheets were consulted.
Chasing 213 in 40 overs, Coleraine had been in charge of the chase throughout, with Marcus Poskitt's fluent 56 from 54 balls (6 fours, 2 sixes) guiding them along.
Professional Ravi Karunaratne hit 4 sixes in his 35, while skipper Matthew Hutchinson made a positive 34.
However, at 138 for 3 with the dark clouds gathering, Poskitt fell to a Davy Rankin full toss to the last ball of the 24th over, followed by Hutchinson in Ian Young's next over.
The rain was falling as Young struck again, and as Carson trudged off, he was followed by everyone as the heavens really opened.
Earlier, Man of the Match Davy Rankin again top-scored with 65, putting on 69 for the first wicket with Ryan Clarke (35) and 88 for the second with Irosh (58) as Bready made 223 for 6.
Stephen Hutchinson with four wickets the best for the Bannsiders.
You have to feel sorry for Coleraine who went toe-to-toe with Bready for two days in what was a very entertaining contest.