Well I've just measured both ends and both threads are 3/8. The brake kit from minispares says its metric at one end. All I can think is when I took the brake lines to my local garage to get shorted, they must have put the wrong fitting on. Think I'll buy a flaring kit next timeCan anyone tell me which end on the line is metric and which is imperial?
Bummer ! But glad you found this the way you did.
The Threads in those 'regulators' are M10 x 1.0. I'd say that the fitting on your Brake Line was 3/8" UNF.
I've tried the brass fittings a while back and I gotta say, I'm not crazy about them at all.
Edited by HUBBA.HUBBA, 23 June 2019 - 04:20 PM.