So I've got a 2005 Kia Optima 2.4l LX. I asked this over at kia-forums.com but no answered yet. Hopefully you guys can help me out This weekend it's brake line time. I've never made a flare before so I'm leaning towards pre-flared PolyArmour lines from AGS, stuck together with unions. I've heard it can be tricky to make flares, and the pre-flared lines seem like a good way to avoid them altogether for only a couple of bucks more. How do I know what flare type I'm going to need to fit my master cylinder and brake hose connector? I see there's three types for sale - ISO bubble flares, SAE invert flares, and Japanese invert flares. I think the Japanese and SAE are the same, but one with SAE nuts and one with metric nuts (?). I do have a replacement brake hose. From looking into it, it looks like the picture of the cut-away ISO/Bubble flare connector here ( http://store.fedhillusa.com/flare.aspx ). Would that mean the whole system is bubble flare? Is it possible to identify the flare type just by looking into a connector like that? I'm using a friend's shop and I don't want to bug him for rides around during the repair, so I'm trying to get the right stuff all lines up before I head over there. If somebody knows for sure how I can figure this out (or if you've done brake lines on this car and just know), I'd appreciate the info! Thanks!