It's a lot more likely you'll have good luck on brake parts by having the original stuff rebuilt, even if it involves getting the castings sleeved to correct pitting. I'm seriously considering tooling up to rework brake cylinders by installing stainless steel sleeves- - - -Fabricating holding fixtures for a lathe or a mill isn't terribly difficult, and once the fixture is made, sleeving dozens or even hundreds of cylinders becomes a pretty routine operation. It looks like there would be enough demand for the service to make it worthwhile train someone to keep the machinery humming!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!