I usually use the old spent brake pads and a c-clamp to compress the calipers. But it depends on how bad they are stuck. I wound up putting 2 new calipers on my fj40 last summer because only 2 out 4 pistons on each caliper were functioning. And the bores were scored up way too much for me to even bother attempting a rebuild. Reman calipers were $40 each from napa for the old cruiser.nastynate said: