try this first ... try rotating the tires back to the way they were or from side to side and see if it pulls to the left or stops ... some times it can do that

 

i have rotated my tires and it didnt help. next week im goin check it out.

 

does pull harder when you hit on the brakes? check your pads and brake rotor. if one side is uneven that can cause you to pull one way. I replaced my pads and rotors and it drove straight from there on. (till i nailed a curb )
this happen on 2 of my vehicles

 

yea it sounds like it may just be a sticking caliper or something.....

 

bow you will just have to tear into it to see what the problem is. my trouble is in the bearing.