I'm just speaking from experience. What I've actually seen. The original K/H pistons were made from bakelight. Stainless replacements ain't cheap. If you buy reman calipers with stainless replacement pistons they are even more not cheap.
I'm the guy that member BillGrissom mentioned that rebuilds these Kelsey Hayes 4 piston brake systems to bring them back to operating condition, so other people can put them back into use on their cars. FYI. There is no such thing as a bakelight piston, original, to the Kelsey Hayes 4 piston brakes, for the Mopar cars, or the 65-67 Ford Mustangs, which used basically the same 4 piston KH calipers. All are metal pistons. Never heard of, never seen a bakelight piston. Have no idea where that "rumor" ever came from, or started. Also, the factory Superstock 68 Hemi Darts and Barracudas were equipped with these 4 piston KH disc brakes. They stopped those cars quite well at the end of the quarter mile, and are very good braking system, even to this day. The only thing different between the Superstock system, and the "street" cars was the Superstock cars used a rotor, that's for the 4 1/2 inch bolt pattern. I would like to feel that i know a thing or two about these brakes, as i have been rebuilding them, and then selling them for the past 8 years or more. I kept track, and i sold 25 of them to the Mopar people, during that time, plus others for the early Mustangs. Ya, modern brakes have mutiple pistons in the calipers, so maybe technology is going back to the old days, which was wasn't bad to begin with, anyway. Just my two cents on the subject, this morning. JV.
