2003 Chevy Astro pulls left just before stoping

2003 Astro AWD V6, vehicle runs fine, when braking there is no pulling left until the last few second before coming to a complete stop, any idea on why this is only occurring in the last few seconds of braking? New pads, rotors, caliper (driver side only), bleed driver side only. Plan to take a look at the Right side caliper and bleed R then L again. Anyone out there having the same problem? What could be causing this, have read some others about suspension but that doesn't make sense because it is only occuring for a few seconds at the end of the braking cycle..........