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Ed Anderson wrote:
No question you normally want to use fittings of matching metals. However, there has been some discussion about very small aluminum fittings (such as -3) not having much reserve strength (compared to larger aluminum fittings and of course steel fittings).
The Cleveland calipers I use come tapped for an (AN-4) - 1/8NPT fitting. I use this fitting to screw into the caliper. Then I use -4 Steel hose Fittings that mates with a -3 brake hose (strange I know, but they make them). Since the standard fittings for the Clevelands are the above mentioned AN -4 - 1/8 NPT fittings, I use the aluminum -4 fittings (NPT on one end) to screw into the aluminum calipers and screw the -4 steel hose fitting onto the AN portion of the caliper fitting. All the brake fittings on the RVs are -4(which I already had installed), so I stuck with that (except for the -3 hose). You can certainly use -4 lines, but I found them to feel a bit mushy for my taste and prefer the smaller -3 hose.
My 0.02 worth
Ed, can I get you to give me 0.03 worth? 8*)
I've order 3/16 (-3) aluminum tube for the 'middle' runs that will interface with well anchored bulkhead at both ends. The ends will obviously have to be flared connections. Are you saying there are aluminum fittings that will interface the -3 flared tube with -4 connections? --
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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