Above copied from my running resto thread when I did work on Suspension and brakes a year or two back.I mentioned on this weeks team meet that when I removed the brake pipe gland nut from the rear callipers, the pipe still wouldn't come out of the calliper. With a bit of wriggling, it was out, but the end was clearly quite damaged.
Looking inside the calliper fitting, there appeared to be a circular raised ring, that would have cut into the end of the pipe swage. Both sides were the same. It looked very uniform and hence looked like it was an original feature.
"That's a PO bodge" says Pete. Then followed a little discussion about steel pipes maybe originally.
I recently came by a pair of front calliper's in far better condition than mine, so embarked on a clean and minor refurb activity before fitting.
They were the same , with a strange raised portion inside the calliper that the pipe would seal against. Again, the tube fitting had a single swage ( Ball) on the end and a sealant of some kind around the pipe to fitting and thread. The brake pipe fitting was very definitely a bodge, but it couldn't be a coincidence that the calliper looked the same, so time for our old friend Google.
Resulting in this :
http://www.fedhillusa.com/?page=flare#: ... %20flare.
So the correct pipe swage into the calliper is a double swage, giving an inverted cone. And I always thought that a general rule was a pipe nut took a double swage ( inverted cone), and a male pipe fitting the single swage (Ball). - And it seems many mechanics who replace the hard pipe into the calliper believe the same based on my experience.
Every days a school day.
Tony