[89basemodel]

I actually just went through all of this over the last couple weeks as I was getting my new supra (to me that is) into shape. I had a hell of a time on different calipers. The main one actually being the front left.

Easiest thing i found to do was to unhook the brake hose then compress the piston in a vice to break any rusted together parts. Then putting the hose back on and bleeding the brake. Followed by pressing the brake pedal several times to push the piston out. You get brake fluid all over your hands and the ground but its sure fire.

Second after pulling the piston out noticing a large amount of rust on it. I bought a brass wire wheel at lowes. The brass is very important because it is a softer metal than the piston so as not to score the piston itself. With a bit of wd40 as cutting fluid i used the wire wheel in a drill press and scraped all the rust off of the piston. Following that i cleaned up the inside of the caliper with some #0000 steel wool. It cleans up very well and is fine enough not to polish too much material.

Easiest manor i found was getting a junk screwdriver with a rubber handle, locking it in a drill and banding (yet high enough to keep the band out of the cylinder) the steel wool around it so it was like a huge steel wool q-tip. Putting it all back together with new seals is a chore but worth it in the end. Smooth operation.

As for the motion pistons in the caliper, moly lithium grease was the best lubricant. After of course using that brass wire wheel on the rust. I got lucky and all my boots on my motion pistons were in good shape.

As for cost
Front caliper rebuild set: - 15
Rear caliper rebuild set: - 13
Brass wire wheel: - 5
Gallon of brake fluid: - 14
Moly Lithium grease: - 8
Total cost: - 55 dollars

Hope this helps