Are they whitworth 3/16 or bsf 1/4? ever slightly larger than 11mm.
if your calipers are imperial brake pipe fittings they would be earlier numbers than those i gave you
first calipers had imperial securing bolts and pipe fittings , then metric pipe fittings but still imperial securing bolts then both metricso they could be metric? I'm off to get some bits and figured for a few pence I might as well get some fittings in case the old ones on the pipe give me any problems.
you can tell by looking at the fittings on yours which are whichIm assuming the new calipers will be metric, but we all know about assumptions being the mother of all f ups.
3/8 bolt is 9/16 head, pipe fitting is 7/16Or maybe 9/16”. Been a while since I had imperial brake lines on mine.
you can tell by looking at the fittings on yours which are which