Depends on how badly your pistons have seized. I had a load of old SRAD calipers and those Sealey pliers didn't have enough leverage to even turn the pistons, never mind extract them, and the serrations on the tips (that are supposed to grip the inside face of a piston) just smoothed off. NOT impressed. I think someone needs to make a set of mole-grip type locking pliers.
Admittedly, these were old seized pistons, but just goes to show even special tools sometimes DON'T get the job done. In hindsight, I'd buy a set of those expanding piston pullers, but you'd have to split the calipers to use them.
Meantime, I made a brake rig out of a SRAD rear brake and reservoir and goodridge line, and I hydraulically pumped all the pistons out.
