If THEY didn't grind, then you need to or you are risking a failure of the spindles as well as the lousy turning radius.
The outer edge of the lower arm has to be ground or it rubs the bolts that secure the axle part of the spindle. Basically, the lower a-arm needs grinding in a couple of places.
Get it done! It's not a casual "detail" at all and if the installer didn't do it, they don't know their butt from a hole in the ground doing spindle installs. I did my own and didn't grind and had to take the lower ball joints free again to do it after I had problems. I didn't know my butt...either!
Even after the grinding, the brake problem will be there, but your turning radius increases and you don't need to put it at lock so far. Also, you won't damage the spindle bolts.