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not sure about 2004 Pontiac, but i have 1995 Nissan Maxima that i couldn't get rear brake caliper pistons to go in, found out they actually are threaded inside caliper so that piston has to be "screwed" in, can't just push it in with c-clamp. there's a tool you can buy to do it, but i made one myself with a 7/8 socket that i grinded down to have four points that matched up with the notches on the piston head. even then, it was very difficult, it doesn't screw in easily. if your piston head is flat faced and has notches on it (3,6,9, & 12 o'clock positions on mine), it's probably that kind. good luck.

I have an '04 Vibe. Easiest method is to buy a brake pad spreader from an auto parts store. They are usually run $6-10. Its just a long screw with a twist knob at the end and two metal plates. You fit the plates into your brake caliper and turn the knob until the piston is pushed back in.

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Q: How do you push the piston back in brake caliper on a 2004 Pontiac?
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