Exactly. They don't press straight in, they screw in. You also have to line-up a mark on the piston with a mark on the caliper correctly, when screwing the piston in.
2012 GT Premium, Brembo PP, MT82, 3.73s, Blk/Blk. Bama 93R, Koni Yellow Rear Shocks, Hawk Ceramic pads, Luxurious & Plush Floor Mats