Roof brace question

Has anyone had the roof brace to the roof bond break such that it makes noise on bumps? Years ago I ran over some of those big groves they had in the road before toll booths and after that the brace on the passenger half would make noise on bumps. I know it's that because if I push on it with my hand when hitting bumps it doesn't make the noise. How is the brace attached to the roof on a 67 Dart. Removing the light it looks like solder or some type of adhesive. Looks attached at the light from what you can see but it's only one side.

brace 5.jpg