The hosts took the lead after 19 minutes when Iliess Macani scored in the corner, before Kallum Watkins replied six minutes later.
Deon Cross made it 12-4 to Salford early in the second half before the Broncos' Will Lovell was sin-binned.
Salford had King Vuniyayawa sent-off for a tip tackle on 55 minutes but the Broncos failed to capitalise.
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