Today I rebuilt the master cylinder for the brake system with a kit I got from Germany a while back. I started by degreasing the body and knocking off the rust with some 100 grit sandpaper. I lightly polished the exterior of the cylinder on my bench buffer with a spiral pad, leaving most of the sand casting pits to give it a shiny but cast appearance. I heavily sanded and polished the forked piece and pin that connect to the brake pedal. I am planning on having carpeting, but will be leaving the pedal box exposed, so I needed these pieces to look nice and shinny. I then etched the inside of the cylinder with muriatic acid and cleaned it with a rolled up scotch brite pad. Next, I thoroughly rinsed all the parts including the new rubber bits from the rebuild kit in warm soapy water. I blew it all dry with compressed air and started the rebuilding part. Assembly was a breeze, even with the German language instructions. The only part I re-used was the rubber boot on the top where the reservoir feeds the cylinder. Unfortunately it did not come in the kit. Afterwards, I covered the ports in masking tape to keep debris out and put it in the done pile.
