On the factory 4x4 trucks, there is a spring from the flex hose on the front drum brakes to the inner fender, to hold the brake line out of the way and keep it from sagging into the path of the tire. I thought this was a modification done by a previous owner, but upon consulting the 1960-1966 Chev/GMC Factory Assembly Manual, and a few other fatory 4x4 trucks I own, I discovered this was the factory solution on the 4x4 trucks, but I have never encountered this issue on the 2wd trucks. This may be a good solution to your situation, as well.
