if they are disk brakes in the rear and the plunger is smooth or is concaved then you should just be able to push them back in, if there is a slot or a cross in the plunger try turning it like you would a screw and they should go in other than that i dont know
In addition to the above answer, as I found out on my '88. If you have to twist the piston into the caliper, there is a tool that resembles a cube with little bumps on it that works with a 3/8" ratchet availiable at a parts house, I paid about $12 for mine.
Actually I rented the tool at autozone, complete refund with no purchase. It turns and compresses the cylinder at the same time.
Use caution the piston has a worm thread in it, this is how the parking brake works. Never use a c-clamp to compress the piston in on this type of caliper. As stated above use the tool to twist the piston inward. If you strip the the threads you will have premature brake pad wear. To pre load the piston's back when the calipers are back on engage the parking brake 20 times this will push the pistons out so when you step on the brake the pedal does not go to the floor.
If parking brake is attached to these calipers a special tool (not expensive) is required, because these pistons are threaded Tool available at Sears or auto parts store
You will need a 3/8" allen wrench to remove the anchor pins for the calipers and a "C" clamp to compress the piston back into the caliper.
I can only assume that Z0, means Z06. There was not a Z06, in 97. And the brake calipers are the same for the two years.
MOISTURE IN YOUR BRAKE FLUID. FLUSH SYSTEM WITH NEW FLUID.
I have used a large "C" clamp, to compress the caliper flush to the face.
Can you put a 1994 thunderbird motor in a 1996 thunderbird?
On your 1996 Ford Thunderbird : In the fuse panel under the dash on the drivers side : ( the 15 amp fuse marked STOP / HAZ is the fuse for all 3 brake lights ) * the high mount brake lamp and the stop lamps
Be sure to change both front brake hoses. I didn't and my calipers would lock up.
Check your rear pads and brake calipers
FUSE BOX located above brake pedal driver side.
YOU NEED NEW CALIPERS . THEY ARE STICKING
A jack, and x-wrench, and that's about it. pull off the brake drum housing, and remove the old brake pads careful not to brake the aluminum calipers. then, do everything backwards.