Currently replacing numerous rear brake components and having a tough time releasing brake pipe unions between the last metal pipe section to the outer flexi hose. I tried everything and now rounded off. These metal pipes have been replaced before and have been fabricated with sufficient slack so I’m hoping to cut, fit a new union and re-flare the existing pipe to connect to my new outer hose. I’m struggling to source the union however and as I can’t get it out, cannot measure it. Does anyone know the dimensions of this union? I’m of the understanding that the unions that connect with flexi hoses are longer than the standard metric ones. BMW can obtain the complete rear pipe section complete with unions but I’m concerned I’ll then have problems at the inner hoses which I hadn’t planned to disturb until I replace the next sections of metal brake lines, not a job for right now. Any info here would be greatly appreciated and sorry this post is a bit ‘war and peace’!