BMW E60 / E61 rear brake line repair (mystery brake fluid leak) 

Thaks for the kind words. I also tend to dislike "over-produced" DIY videos, or those that spend time with the camera pointed at the mechanic (wouldn't want to put anyone through THAT pain). ;-) Sometimes I go into more detail than some experienced DIYers need, but I always like to include pointers for those who haven't been doing this kind of nonsense for (many, in my case) decades.

Glad it was helpful!

Let us know how it goes for you. Glad the video helped.

Glad the video helped, and that the awesome little flaring tool worked out for you (I honestly can't imagine how anyone could use one of the "mainstream" flaring tools in that space). I've read contradictory info on the need to do anything special with the ABS. I know there is an ABS bleed procedure that can be invoked from ISTA / INPA (and probably a lot of BMW-specific scan tools), but I'd try doing a regular bleed and see how it goes. You might get lucky.

I never actually measured the original lines, but the tool works just fine on them, as well as the new lines, which seem to be pretty much the same diameter as the BMW. I believe the lines are 4.75mm / 3/16".

@@Mark_H_DIY is double flare needed or does bubble flare is enough to connect new to old lines? Yeah the new ones are all 4.75 mm but bmw has thicker coating thats why they are 5.5 mm

@@bigdeal87 If you are splicing the existing line, it doesn't matter what kind of flare you use, as long as it matches the piece of repair line you bought. Just make sure you know what type of flares your particular BMW has, if you are going to replace the line all the way up to the factory fitting. Then, it matters. :-)

I've seen others (in the US and elsewhere) use similar compression fittings to repair brake lines. I'm guessing that most get away with it, but I'd never, ever do it myself. The fluid pressure on a brake line can reach many thousands of pounds per square inch during an emergency stop (the kind that REALLY needs the brakes to be perfect), and that's not the time you want to find out that the fitting you used is good to half that.

@@Mark_H_DIY I reacted all the more to the relatively large effort and laboriousness of doing this on the car. I have several BMWs and corrosion problems are the order of the day. I have a cracked brake pipe on the old E39 today, so it's waiting for me. But I use ABS fittings, it's on the longest tube on the vehicle, it's really hard to replace. And sealing kits can only be bought with copper pipes, and they can't handle armored pipes. So in these "field" conditions, using this is probably the only viable option. At least temporarily yes. I know a lot of people and car services who normally use it, maybe it works, but I definitely consider it an emergency, not a permanent solution. Thanks for the video with tips and feedback to my commentary. :)