[Healeys] Aluminum brake & clutch cylinders

[Oudesluys]

Anodising is a chemical process that oxidises the aluminium and leaves a 
thin, very hard surface of aluminium oxide, sufficient to fight wear. 
Aluminium oxide is used as an abrasive so it is very hard. It will 
certainly not wear away after a few applications.

Kees Oudesluijs
NL


Bob Spidell schreef op 5-3-2014 16:25:very thin
> AFAIK--not far--anodizing is a chemical process that leaves only a very thin deposit to help prevent corrosion; particularly on aluminium surfaces. If it doesn't harden the surface then it doesn't provide much value, as it would likely be worn away after a few applications of the brakes.
>
> Anyone know otherwise?
>
> Bob
>
> ----- Original Message -----
>
>
>
> I suspect the difference has to do with the smoothness of the finish after
> honing. Most of the hones sold for this purpose produce a coarse finish. The
> new reproduction cylinders (which are not anodized) have a very smooth (fine)
> honed finish.
> Gary Hodson
>
>
>
>
> I don't know if original cylinders were honed or not. However, after
> honing several original cylinders, years ago, I noticed the brake
> fluid would turn black very quickly. The brake fluid was relatively
> clear prior to honing and I am certain it was not related to a
> contamination issue.
>
> John Spaur
> '62 BT7
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