$10.00 at Harbor Freight.I should also buy one of those tools............but knowing me I probably wont. lol
I use one of the OLD pads between the piston and clamp to apply even pressure when pushing the piston back in.
I changed mine a while back. I had 141,000 miles on them. I changed everything Rotors and pads, although I probably could have gone another 10-20K. I saved the rotors because they were not worn enough and I will have them machined for future use.
I got that kind of mileage because of my 105 mile daily commute, I only touch the brakes 16 times in a normal day over that 105 miles and I also let up on the gas way before I need to use them. My last set of tires lasted 91,000 miles.