Topic: Restoring a master cylinder

[Keith]

I looked through FAQs, but didn't see this topic. How would you restore the finish on an original master cylinder? (Black) thanks for any suggestions.

[TwoTired]

The originals were anodized black.

[Dunk]

Originals were anodized. I used caliper paint on mine. Just need to be careful about brake fluid. Are the David Silver repops anodized and original looking?

[MattCB750K8]

I just finished rebuilding mine. I used gloss caliper paint. I'll post up a pic tomorrow. came out very nice.

I lightly honed the bore first.

Degreased and cleaned it several times to make sure I avoided fish eyes,

Plugged and masked all the holes plus the cap threads.

Finally degreased and cleaned it several times to make sure I avoided fish eyes, Sprayed and let it dry a couple days. I gave it plenty of time to dry before I rebuilt it.

I don't know of any truly dot3/4 resistant paint. Caliper paint is usually for temp not fluid resistance. Powder coating may be another option, again prep work would be the same but even more important to mask areas when you don't want build up.

Works and looks nicely.

[Keith]

Thanks guys! I was wondering about paint or finding a shop to re-anodize.

[texianbiker]

I de anodized my K0 master cylinder and cap with Easy Off oven cleaner then had both powder coated matte black.  The look is OEM new and the powder coat is more brake fluid resistant than paint and more fade resistant that the dye used to anodize.

[Scott S]

 Here's how I've been rebuilding/restoring them lately. 

https://www.davidsilverspares.com/CB550K1-1975-USA/part_123904/

[Ujeni]

If you have them re-anodized make sure your anodized uses the correct chromic method. The more-common sulfuric method will result is a dull finish.