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I was going to install Aluminum tubing for brake lines on my bike (still using some rubber hose to take up movement of suspension). I was warned that attaching them with compression fittings could be disasterous due to the low fatigue stress of Aluminum.

My friend at the shop who brought this up says that because the compression fitting deforms the tubing to create the seal, the added strain hardening that happens here is what will ultimately cause the tubing to break.

I have compression fittings with a small fitting that surrounds the tube. To my thinking it was this fitting that deforms to snug up to the tubing. I am not sure if this will cause a problem.

Can anyone tell me if they have done this before? Is Al tubing really a horrible idea? Are there any other ways I might attach it to my master cylinder besides a compression fitting?
 

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your buddys right. look through some catalogs, there are kits for doing what you want to do especially decsigned for brakes. id also stay away from the alum for the same reasons. dont fool around with experiments. there are companys that do only brakeline related components. braking...galfer...and i know there are more. do some shopping, before you need that fist full of brakes and realize homemade al was a bad idea.

jc
 
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