How do you get the piston back in the caliper of a Lincoln mark viii?

If you are careful you can turn them back in with a pair of channel lock pliars. but use caution to only grab the very edge of the piston. I replaced my rear brakes that way and had no problems. if you are talking about the rear pistons for the brake calipers, they are similar to that of the toyotas, you need to goto autozone, or your local parts store and ask for the disk brake tools, they need to be "wound" back in unlike the fronts which will just slide Lostsoul