Bill, I do not have experience with sleeved calipers , but did have my 71E's brake servo brass sleeved, due to pitting, at Apple Hydraulics in NY. First rate job and like the calipers should prevent further pitting due to moisture contamination of the fluid. I will be refreshing my IRS this winter and may be going down that same path once I evaluate the calipers. Good luck and let us know how it goes. Rick