Could be more than that too! But if it is the brake, when it does it, pull over and that hub brake assembly will be hotter than the other side. I had a older nissan p/u that would have brake grab for no reason, and it would want to take you right off the road right now!!
Check
~leaf spring bushings
~tie rod ends
~u-bolts
~hub bearings
~high steer/knuckle bolts