Zerek

It is rack and pinion, but I have not had an alignment yet but it doesn’t jerk the whole time I I’m on the brakes, I will be slowing down then it will jerk then straighten back out

So I have a 2003 GMC Sierra 1500 and I just recently have replaced all the front end components such as ball joints, upper control, arms, inner and outer tie, rods, etc. And a new master cylinder. Ever since then when I hit a bump or press the brakes, the truck will jerk to the left. It has never done this before. Any ideas?