I know this will raise a few eye-brows,, but brake adjustment wont cause a pull...
WITH ONE CAVEAT... if you crank up the adjuster so much it causes a brake to drag, and overheat, thus losing efficiency thru heat build-up.. rendering that brake near useless, while the other 3 wheels brake normally., this will cause a pull..
Loose adjustment will cause low pedal, - no pull
Air will not cause a pull...
Having a contaminated shoe/pad, stuck/leaking w/cylinder/caliper on right side, will cause a pull to the left...
Loose suspension components can cause a pull under braking as RRR states..
hope it helps
