How to compress rear brake cylinder for 2006 grand prix?

Other answer:

Brake cylinder? I'm pretty sure youu have calipers in the rear.
Need a special compressor that screws and presses at the same time. lisle rear brake caliper tool.
what I do is take a long bolt and two nuts . and find two big washers. them place the washers on both ends of the bolt, then tighten the two bolts expanding the washers out. this way no tension on the cylinders because they crack easy
on a disc brake, use a c clamp
Innocent Man:
You need a big C Clamp