Anodizing on Brake Caliper Arms a Problem?

Almost all rims and groupset components have some form of anodising so you
cannot assume that the anodising is likely to cause cracking.

"Jennifer Donleavy" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Second, does having the brake caliper arms
coated in this way cause failure problems the way that anodizing does
on rims, that is, when I use these brakes will cracks form in the
coating that will propagate into the soft aluminum arm? Third, if
this is a problem, what's the best way to remove the coating?

Jennifer D

in a word, "no" - not because of anodizing.

caliper arms are usually forged, not extruded, so you won't see the same
type of cracking seen in rims.

Jennifer Donleavy said:

Hi Ya'll!

My beloved Superbe Pro brakes have died. The return springs, rusted
and cracking, stopped doing their job. So I have another pair of
old-style single-pivot brakes that I would like to put on my bike --
Sachs Rival 7000 (made by modolo) that have never been mounted.
However, the caliper arms of these brakes are covered with a tough
grey coating, which I presume is anodizing.

First, is it definitely anodizing, or could it be extremely tough
paint or powder-coating? Second, does having the brake caliper arms
coated in this way cause failure problems the way that anodizing does
on rims, that is, when I use these brakes will cracks form in the
coating that will propagate into the soft aluminum arm? Third, if
this is a problem, what's the best way to remove the coating?

Thanks!

Jennifer D

Jennifer Donleavy <[email hidden]> wrote in message news:<[email hidden]>...

Quoted message said:

Hi Ya'll!

My beloved Superbe Pro brakes have died. The return springs, rusted
and cracking, stopped doing their job. So I have another pair of
old-style single-pivot brakes that I would like to put on my bike --
Sachs Rival 7000 (made by modolo) that have never been mounted.
However, the caliper arms of these brakes are covered with a tough
grey coating, which I presume is anodizing.

First, is it definitely anodizing, or could it be extremely tough
paint or powder-coating? Second, does having the brake caliper arms
coated in this way cause failure problems the way that anodizing does
on rims, that is, when I use these brakes will cracks form in the
coating that will propagate into the soft aluminum arm? Third, if
this is a problem, what's the best way to remove the coating?

Thanks!

Jennifer D

If I'm remembering the brakes correctly they were a darkish sort of
mottled grey? If so then it was an Enamel or Powder coating rather
than anodized.. (heavy paint).

In any case anodizing would not be an issue in this case.

jim beam said:

in a word, "no" - not because of anodizing.

caliper arms are usually forged, not extruded, so you won't see the
same type of cracking seen in rims.

Not to mention the metal being many, many times thicker than the
anodized layer, which is not so much the case in anodized rims.

On Tue, 04 May 2004 15:56:31 -0700, Jennifer Donleavy

may have said:

First, is it definitely anodizing, or could it be extremely tough
paint or powder-coating?

Possibly either.

Quoted message said:

Second, does having the brake caliper arms
coated in this way cause failure problems the way that anodizing does
on rims, that is, when I use these brakes will cracks form in the
coating that will propagate into the soft aluminum arm?

Rims are a differrent matter. They have a thin cross-section subject
to far more stress cycles, making them much more susceptible to
cracking due to the presence of very small stress risers. Brakes are
far more robust, and any potential stress risers from crazing or
cracking of the anodization would not, in my opinion, have any
significant bearing on the likelihood of failure.

Quoted message said:

Third, if
this is a problem, what's the best way to remove the coating?

I wouldn't worry about it at all.

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