Here is my brake master cylinder when I took it out of the parts car and tore it down. I was able to remove everything except for the internal piston. After 20 years of sitting it was frozen in there pretty well.
I sent it off to Joe at Sierra Specialty Automotive and this is what I got back a few days ago. First its cleaned, from the looks of it bead blasted to a like new finish. Next, Joe hooks it up to a hydralic pump to remove the internal piston. The inside of the cylinder is then bored out to receive a brass sleave that is then pressed into it. The inside is then bored and polished to the correct diameter and the port holes are drilled.
Picture of the brass sleave.
The last picture is of the cylinder, the pistons that came out and need to be cleaned up and a rebuild kit I got from Miles.
Thanks for such great work Joe. As always thanks to Miles for the parts and your never ending help.