Regarding pushing the pistons in, I was advised that I should open up the bleeder screw so I am not pushing brake fluid / dirt / air back up the line while forcing the pistons in. Theoretically there should not be dirt or air in the line at the piston anyway, but I tried this and is was sooo much easier to push the piston in with the bleeder valve open. I did not need a clamp at all. Of course, I had a clear hose connected to the valve and going into a bottle, and was planning on bleeding the brakes anyway. The clear vinyl hose allows you to see any air bubbles and also which way the fluid is running.

With the pistons all the way in, I knew if there was resistance somewhere, it was not the piston sticking out too far. I did have to scrape some dirt or rust away from the sides where the edge (width) of the pad fits in, and that was my problem. But without the piston being all the way in, I would not have known that.

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