[cartman]

Got it figured out. Had a self-locking nut go bad on the passenger side radius arm, and it backed itself out. Couldn't really tell anything was wrong when the car was up on jacks, but I started using a pry bar move things around to simulate load, and the right side moved way too far back. So what was happening that when I hit the brakes hard, that put an extra load on the suspension, and since the nut wasn't there to hold the radius arm in place, that allowed it to move towards the rear of the car, pulling the car to the right. $1.29 for a couple of new self-locking nuts plus some Loc-tite for added protection, and I'm good to go.