Hull FC (6) 8
Goals: Tickle 2
Bradford (6) 24
Tries: Nero, Cook, Tadulala, Burgess Goals: Deacon 4
Burgess scored the last of Bradford's four tries
Bradford scored three unanswered second-half tries to heap the pressure on second-from-bottom Hull.
After a period of early pressure, Shaun Berrigan went over from dummy-half to put Hull ahead but Chris Nero collected a Ben Jeffries pass to level.
After a penalty from either side, Matt Cook and Semi Tadulala scored twice in five minutes for the Bulls.
Cook crossed from dummy-half and Tadulala in the corner before forward Sam Burgess barged over late on.
The result lifts Bradford into joint second in the Super League table, although the remainder of the top four have yet to play this weekend.
But injury-hit Hull have now won just two of their 10 fixtures, collecting only five points, and the result increases the pressure on coach Peter Sharp.
The Bulls' preparations had not been helped by the withdrawal of David Solomona - and with Willie Manu in top form Hull started strongly.
Manu barged through several tackles before offloading into the arms of Bradford's Paul Sykes.
And it took an interception from Wayne Godwin to cut out a Kirk Yeaman pass after another break from Manu before Berrigan eventually scored.
The home team lost momentum after Richard Horne left the field with an arm injury and the Bulls levelled two minutes before the break.
Bradford were dominant after the interval and Paul Sykes should have scored after a break from Burgess, but he was dragged away from the line by Yeaman.
However, the match was over as a contest after the scores from Cook and Tadulala, who went over after neat work from Burgess and Nero.
Hull coach Peter Sharp:
"I saw some really encouraging signs, but at the moment we can't sustain it for long enough.
"We let teams off the hook all the time - and you just can't do that.
"Bravery is not a quality we lack but we need to roll up our sleeves. We need to be mentally tougher."
Bradford coach Steve McNamara:
"Things just aren't going for Hull at the minute.
"I really feel for their coach. I think he's a super bloke, a super coach - and I think he's got a super side when he's got everyone back on the field.
"I think people need to lay off him - and you'll see how good Hull FC will be as the season goes on."
Hull FC: Tony, Byrne, G. Horne, Yeaman, Raynor, R. Horne, Lee, Dowes, Berrigan, Cusack, Radford, Manu, Tickle. Replacements: Thackray, Houghton, Washbrook, Wheeldon.
Bradford: Halley, Evans, Sykes, Hape, Tadulala, Jeffries, Deacon, Burgess, Godwin, Lynch, Nero, Finnigan, Langley. Replacements: Kopczak, Cook, Feather, Harris.
Referee: B Thaler (Wakefield)