Rumor has it that aluminum brake line ends corrode in contact with stainless steel. Well, if this is a problem do you believe the solution is to mount stainless steel fittings to all aluminum calipers and master cylinders…? Spiegler uses the most modern technology, which includes anodized aluminum fittings that will not corrode. And we have DOT and TUV certification to prove it. With Spiegler's patented designs, we guarantee the entire brake line for life*. *Guaranteed for the life of original owner and the original motorcycle.