You can remove brake caliper pistons with compressed air....IF YOU ARE EXTREMELY CAREFUL!!!
Luckily the granada caliper assy had a full charge of old brake fluid. If they are dry you need to fill the caliper reservoirs and let them soak for a few days. Then drain all the fluid from the caliper reservoir. Using a tapered rubber tip trigger style air nozzle with 120psi we sealed the tip into the threaded brake line hole, by pressing on the nozzle really hard, and pulled the trigger. We put a rag around the nozzle so fluid wouldn't shoot back at us. And we kept our fingers out of the way of the piston. BOOOOM!!!! The piston shot right out. We removed the old seals and took the caliper assy to the hot tank. Saved trying to figure out how to remove those pistons. If you do this, use extreme caution.
Luckily the granada caliper assy had a full charge of old brake fluid. If they are dry you need to fill the caliper reservoirs and let them soak for a few days. Then drain all the fluid from the caliper reservoir. Using a tapered rubber tip trigger style air nozzle with 120psi we sealed the tip into the threaded brake line hole, by pressing on the nozzle really hard, and pulled the trigger. We put a rag around the nozzle so fluid wouldn't shoot back at us. And we kept our fingers out of the way of the piston. BOOOOM!!!! The piston shot right out. We removed the old seals and took the caliper assy to the hot tank. Saved trying to figure out how to remove those pistons. If you do this, use extreme caution.
