Denny Hamlin’s brake situation at Iowa Speedway appeared so dire on Sunday prior to the race that he effectively forced NASCAR to call his bluff. “We tried to run something a little bit different, not unknown,” Hamlin said. “Other teams have run it quite a bit before. NASCAR rules do not allow teams to change brake pads until after the race starts, which would be a lengthy behind-the-wall change. “We do not want 36 teams having a qualifying brake pad and a race brake pad.”