I want to paint my calipers soon

[Jamesp]

If I were going to only paint my calipers, I'd clean the heck out of them starting with wheel cleaner and moving through other cleaners to really strip them, scotch pad the clean paint to scuff it so the new paint would adhere, then mask and spray them. If I removed them and went through the pain of opening the hydraulic system, they would get a rebuild along with new paint. This string prompted me to buy PORSCHE stencils from Ebay to repaint it back onto one of my front calipers. One note on masking, go big especially with red paint or the overspray will show. You could go to an intermediate point and remove the two caliper bolts but leave the brake line attached for better access. Best of luck!