Assessment of Full Brake and Fuel System Overhaul

What happens here

After failing to replace the brake line, the presenter realizes the extent of the truck's corrosion. He holds up the proportioning valve, showing that several brake lines attached to it have broken off or are completely seized. He determines that a full brake system overhaul is necessary, not just a single line replacement. He also notes that the fuel tank needs replacement due to rust flakes, which continue to clog the fuel line. He calculates that he has already spent $300 on initial efforts and estimates thousands more for a full restoration. Considering the truck is already sold "as is," he expresses doubt about continuing.

Goal: Determine the complete scope of required repairs and their financial feasibility.