Here's a pic of my(less than 50,000 mile)GMC after loss of brake fluid caused my two-tones to hit the floor.
(2 brake lines from MC to module/clamped to(prematurely)rusted-out main frame, causing rusted-out brake line/fluid leak)
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The latest:
That seems especially bad , it’s an area that will trap dirt and collect moisture ,, rust is guaranteed there , especially in areas with road salt.
I had previously bought a mid-90’s GM from Michigan when it was about 10 years old,,, the rear brake line rusted and popped on it too.. I cut a non rusted section of brake line a foot forward of the break and used a LARGE pair of vice grips to roll/fold/crimp up the line to get it home...