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To tie into the rear 6mm brake line, the 3/16-in. line is flared for metric bubble flare and is threaded into a 12mm x 1.0 to 12mm x 1.0 metric bubble flare union. To clean up the line routing we cut off the end of the line and routed it down along the framerail. We found the metric line nearly impossible to flare as factory lines are of a harder steel than typical aftermarket brake lines, so if you are unsure if you can flare this line, it's probably best to just thread on the union and deal with the factory routing.