320 dreamer

has anyone ever rebuilt their calipers? i have a set of 8/4 calipers that i would like to powdercoat red which means complete teardown , powdercoat and rebuild. i have never done calipers but know my way around a toolbox. is there any diy for rebuilding calipers?

also does anyone know the flow rate for the master cylinder? my 32 has 2/1 setup oem so im sure i need a larger m/c to push the 8/4 setup. any help would be greatly appreciated