Good question.
I have always assumed the bores were treated, since they have a slick,
shiny surface which isn't characteristic of untreated aluminum, which is
usually porous and dull in appearance.
A quick question to Mr. Google returned:
http://www.ehow.com/how_5940980_rebuild-wheel-cylinder.html
"Hone the inside of the wheel cylinder with a wheel cylinder hone,
attached to an electric drill, if the cylinder is made of cast iron or
steel. Aluminum wheel cylinders should never be honed. Aluminum wheel
cylinders have a hard, protective, anodized surface inside to prevent
corrosion. Honing will remove this surface and cause excessive corrosion
and wear. Instead, clean the inside of the aluminum cylinder with soapy
water and a green scotch-brite pad to remove debris that collects in the
cylinder bore."
I'm surprised the treatment is anodizing, because I always thought of
that as a superficial treatment--not a hardening process--but apparently
it does harden the surface.
bs
<http://www.ehow.com/how_5940980_rebuild-wheel-cylinder.html#ixzz0yR5G4tnG>
richard mayor wrote:
> I have a question about the "specially treated hardened interior surface" of
> the slave cylinder. Is there a source out there that explains this in greater
> detail? I always assumed that the aluminum was the same alloy/quality/hardness
> throughout. Inquiring minds want to know.
> Thanks,
>
> Richard Mayor
> BN7L-466 Vintage Racer
> Portland, Oregon
>
>
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Bob Spidell San Jose, CA bspidell@comcast.net
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