Why did Asa bring the silver and gold out of the storerooms and send it to Benhadad, king of Aram?

Asa sent the silver and gold to Ben Hadad to encourage him to break his treaty with Baasha and establish a treaty with Asa.

Why did Asa want Ben Hadad to break his treaty with Baasha?

Asa wanted Ben Hadad to break the treaty so that Baasha would leave Asa alone.