Carlisle moved back into the League Two automatic promotion places after picking up a point in a goalless draw at Bradford.
It was a second straight 0-0 draw for the Cumbrians against a top-seven rival following their weekend stalemate with Stevenage.
But it maintained their five-point advantage over Mark Hughes’ Bradford while moving them above Northampton into third place.
It was a committed and frenetic contest, with plenty of effort from both sides but few chances.
Carlisle edged the first half, with Jack Armer’s cross-shot bending the wrong side of a post. Ryan Edmondson also had a header held by Harry Lewis.
League Two top-scorer Andy Cook, who began his career at Carlisle, came close to breaking the deadlock in the second half for Bradford with a shot that deflected off the bar.
City controlled the second period, but the visitors almost pinched victory with the final kick of the game as substitute Jordan Gibson, a former Bradford player, struck the inside of a post with Lewis beaten.
