The Premier League side head into Sunday's clash at Wembley as clear favourites but Rangel believes that their opponents should be respected.
"People can talk about this game being a League Two club taking on a team from the Barclays Premier League – but I don't think it matters who we are playing," the Spaniard told the club's official website.
"That's because it's a final and both teams are going out to win. As Bradford have shown, they have the quality to beat Premier League teams, but we have also shown our true qualities in this competition."
Bradford knocked out Aston Villa in the semi-finals to set up the meeting with Swansea.