I read here and experienced my van having this lunging or bouncy thing going on when backing up. I just put up with it.

I was rotating my tires when I noticed my passenger right would not spin freely in one spot. I gots ta tell ya, it was a little hard to push it past that spot.
I said "Dam", all this time I thought I had a little rotor warp because I could feel it just before a complete stop at a light.

So I tried adjusting it out and I knew it would just adjust right back and rotating it on the bolt pattern was no good either so........... I took it to be turned.

NO MORE LURCHING IN REVERSE! SMOOTH AS GLASS! GEEEEEEESE!