As for rebuilding the calipers it really was not very difficult and it was my first time doing a set. With some help from my brothers here on moparts and a good parts guy I went for it. I am glad I took them apart as I ended up replacing 6 of the 8 pistons due to rust and would have had a leakage issue or sticky pistons if I had not done so. The brakes work like a dream and really stop my little a-body in a hurry compared to the 9" drums that were stock issue. I also like the fact that I used all factory pieces and feel they work just as well or not better than an aftermarket set. The most difficult part was installing the piston dust boots during reassembly.