How to put put back brake cylinder together on a 1996 buick regal when changing pads?

Same way you took it off, except in reverse. If you're asking about the piston, push it in with a c-clamp.
How to put put back brake cylinder together on a 1996 buick regal when changing pads?
A brake cylinder is not a rear caliper, so if I understand english, I'm going to answer your question, Remove the back wheel, pull off the brake drum, remove the two screws that hold the brake cylinder on, pull the brake cylinder off, then install the new one and secure it.
How to put put back brake cylinder together on a 1996 buick regal when changing pads?
they sell a tool to compress the cylinders in at advance auto parts.
Please clarify. What kind of brakes are you working on - disc brakes, or drum brakes?

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