Greetings,
I cheated when replacing my steel brake lines by doing it in 2 parts, split right in front of the rear wheel. Now I cant get the flare union to work. Using the Harbor Freight double flaring tool, I double flare it, then screw it together. If side A seals, the B side leaks. If the B side seals, A leaks. What am I doing wrong?

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Paul
2004 E500 4matic; 72,000mi