Here's the situation. I've got this Hyundai Sonata with this beautiful new shiny rotor and these brand new brake pads, but the caliper would not compress. So, first let me show you, do you see how there's not a circular hole there? Normally on most calipers there's a hole here and you can put your clamp through there to get the brake pad that you use to compress the caliper piston. You can get the C-clamp centered and it'll put even force on the piston while on this Hyundai Sonata. It won't do that. So, my clever solution was since I can't get a clamp on the normal way, I reversed a clamp with two six inch C-clamps. I was able to turn them both at the same time, giving me even pressure. When I only had the one clamp, this is only a three or four year old car. So, that piston wasn't budging because I was pushing too unevenly. I was worried it was seized up and I'd have to replace it, but then I realized it was just uneven. So, don't make the same mistake that I did. Get two C-clamps and use them to smash it down. If you get them both tight and then turn the handles at the same time, you'll find that it pushes the piston back in with relativ ease. Hope this has been helpful. Sorry about the quality. I don't have my nice cameras with me. Not that I'd want to use them for this dirty stuff anyway. I've got to finish the job, so have a good one.