My 62 LeMans has a single-circuit MC, running to a 4-way splitter. The PO ran a new hard line from the splitter to the rear brakes & I have a slight leak where the hard line connects into the splitter block.
Should I suspect the line since it's new & has been fiddled with recently? Or should I swap the splitter block since it's 47-years old?
More importantly, is there a good way to tell what's bad, or do I just replace them both since they're cheap?

