My analysis is that if it's because of alginment and wheel balancing, then why does it happen only during braking? I have a hunch that my right front brakes are not working.
na-experience ko rin yan with my ES na civic. Slight lang naman ang kabig when braking. It went away when I replaced by tie rod, ball joint, stabilizer link and front suspensions. Problem is I dont know which one was causing it. Hope this helps. =)
tire pressure muna check mo. be sure na pareho ang pressure. then, observe mo maigi yung road condition, baka naman di gaano straight ang kalye. next is alignment. ang huli is piston ng preno. imo