Here are the pictures from my brake caliper rebuild. When I removed the calipers from the car this is how they looked like.
I did a first pass on the sand blaster to remove some of the dirt.
Disassembly of the caliper.
To remove the piston I used some compressed air.
As expected a lot of "stuff" inside the caliper cylinder. The pistons are all in good shape without any corrosion.
I washed the parts with plenty of soap and water and after that used the parts washer. After some cleaning with thinner I applied paint which is better than rust for the heating dissipation. I was going to plate the calipers but it will add more time. Since they are cheap I will buy another set to have it plated once the car is finished.
Put everything back together is very simple on these calipers. Coat everything with brake fluid. To put the pistons back in the bore I used my hands twisting and pressing the piston in. To clean the bores I used some stainless steel polishing compound a piece of cloth and two glasses of wine. The wine should be ingested not mixed with the polishing compound
I re-plated the caliper hardware at home using a small power supply, some chemicals and a zinc anode used on a boat. Not restoration grade but will allow me to reuse the old hardware without have to put up with the rust. Here is my "new" hardware
Here is one of the rear calipers finished and ready to be boxed till I get to put the suspension together in a couple months or so.