rebuilding front disc calipers

74 plymouth valiant stock front disc. not sure on what type they are. as far as the brakes, yes i am looking at how to rebuild the front caliper. the rears are already done, and was really simple. just a square cut circular seal, and the dust boot.. the kit for the front has 4 parts to it i beleive, so it looks as though theres more to it. just wondering...