OK, I got my 73 buttoned up well enough to pass the state inspection. But I noticed while driving it when I brake firmly there is a "pop" that occours when the car settles. I checked it out and it's definitely coming from the passenger front side. All the hard parts are new on the car (ball joints, upper control arm bushings, etc.). Now I got new lower control arm bushings with the rebuild kit, but haven't installed them yet. Could this possible be the source of the popping?