I recently changed rear pads and rotor. While trying to get the pistons back in the caliper to install pads one of the pistons came out as well as a small amount of fluid. Put the piston back in and had no problems for about 500 miles then started loosing pressure to rear brake. I could pump them up but wouldn't hold long. Now there is a leak coming from the caliper. I just ordered a repair kit. I have never done a repair like this before. It looks like the kit comes with 4 pistons and eight seals. How big of a job is replacing the seals and pistons? Is this procedure detailed in the Clymer manual? What tips and tricks can anyone give?