This pacy full back joined from Queens Park Rangers during the January 2012 transfer window having agreed a two-and-a-half year deal with Rovers.
A Liverpool-native, Bradley actually started his career with Newcastle United, but it was at Bristol City that the 29-year-old made his name, making over 250 appearances for the club in a six-year spell.
It was those consistant displays at full back that earned the defender a move to Queens Park Rangers in 2010 where he played a key role as the Hoops gained promotion to the Premier League.
Opportunities for Orr had been limited to just 8 appearances in the top flight in the first half of 2011-12, the player having no hesitation in making the move back to the North West to sign for Rovers.
After starting the 2012-13 season as Rovers' regular right back, Orr lost his place to Adam Henley when former manager Henning Berg arrived.
The Norwegian allowed Orr to join fellow npower Championship side Ipswich Town on loan where he enjoyed a three-month spell at the Suffolk club.
With the arrival of boss Michael Appleton, Orr returned to Rovers at the end of his loan deal.