While replacing my ball joints yesterday on my 62 Fury I pulled a brake drum to check the pads. Found something that doesn’t look Right. While the pads were still thick they and the drums are pretty badly grooved indicating that whoever last changed the brakes probably didn’t turn the drums. More oddly though, these brake drums have a groove that’s probably 1/2” wide and 1/4” deep and must have been machined in. Out of the 2.5” of possible inside surface area on the drum there is about 1 5/8”on the outside, 1/2” of the groove and then maybe 3/8” on the inside. Why on earth would that groove be cut in there as it clearly results in less contact area - is it factory? To top it off the pads are 2 1/2” wide so they go over the groove? Hope these pictures help.