Camara's volley into the top left corner off a corner kick in the 61st minute broke a 2-2 tie, and Bernier iced the game 7 minutes later on a penalty kick.
Sanna Nyassi and Davy Arnaud also found the net for the Impact (5-8-3), who have now scored eight goals in two home games since opening their new home field, Saputo Stadium.
Brad Davis and Will Bruin tallied for the Dynamo (5-5-5), who have gone 0-5-3 in their last eight road contests after winning their first two to start the season.
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