Jarrid Gross wrote:
> Any disimilar metal will yeild a galvanic reaction with time and suitible
> chemical medium.
> This is accelerated with water in your brake fluid, which acts as an
> electrolite.
> As a matter of preference, and overall use, for aluminum, I'd suggest
> stainless over brass, as it is more chemically inert, generally a harder
> material, and has a more similar
> electron valance compared to the copper alloy in brass.
> This will lead to less electrolitic activity.
>
> Probably costs more to machine,. but I suspect it will last an order of
> magnetude
> longer.
>
> Jarrid Gross
The brass vs stainless question, at least as relating to galvanic potential,
depends on the type of stainless steel used. Brass has less of a galvanic
potential (compared to aluminum) than 410, 416, 430, 302, 303, 304, 321, 347,
316, 317 stainless. There are a some types of stainless steel that are closer to
aluminum than is brass.
The problems people have with brake components seems more related to corrosion
(pitting) due to moisture in the brake fluid then it is related to the original
cast iron or aluminum being too soft. Certainly the seals used, which are the
components that actually rub inside the bore, are softer than pretty much any
metal.
Seems to me that probably any sleeve material would work out just fine.
-Roger
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