Technical Master cylinder finish.

I’m getting ready to replace the master cylinder and rebuild the brakes on my ‘40 Olds and don’t know what kind of paint or finish would be brake fluid proof. These castings have a tendency to “flash rust” almost immediately. Any ideas?

 

Powdercoat... that's the only finish other than plating I've found that will withstand brake fluid.

 

Regular 2 pack paint, in US parlance I think that is urethene. Works for me but I try my hardest to not slosh that liquid around, and wipe up any spills asap.

Chris

 

Imron or Epoxy.
or just change over to silicon brake fluid.

 

Thanks for the replies…

 

I've had good luck with Rustoleum appliance epoxy. Properly cured ceramic based high heat works pretty good also, but the master has to be stripped so it can be cooked in an oven.

 

I will vouch for appliance epoxy. Good stuff.

 

Zinc plate and yellow passivate. It will look brand new.

I got some old calipers done.....

 

If you spray the outside cast iron surface with dry graphite lube (available in a spray can) it dries very quickly into a dark grey color. It will prevent that almost instant surface rusting or will cover up slight rusting. It lasts well and can be retouched when / if necessary with a brush and when it dries it's hard to tell it was ever re-done.

 

Eastwood cast iron for me…

 

Spread a little Never Seize on it.... NOTHING will remove that*****!! (just kidding....)

 

Some very interesting ideas.
I like the “zinc plate”, what does that involve?

 

I use Rem-Oil on my bare metal parts and sometimes apply it with a paper towel or then sometimes put some of the oil on a little cut down section of a green scotchbrite pad.



Jim