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you need to have them keep the old parts for your inspection, there are a couple things I'd be suspicious of. First off those brake lines are steel most of the way, then they go into a coupling and a high pressure rubber line goes from the coupling to the wheel cylinder. Which line is rupturing, is it the steel line? If so I'd suspect that they cracked it by over tightening it, or they kinked it thereby restricting the flow and creating too much pressure. If its the rubber line, and it's not ruptured then they may not have tightened it enough and simply came unscrewed. Go check your brake fluid, is it low? is there brake fluid around the drums? how about somewhere on the undercarriage of the vehicle?
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