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safely freeing a seized brake piston

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AshimotoK0:
Assuming you are replacing the seal, I just heat the alloy body with a Mapp gas torch and then tap the housing sharply onto a flat steel plate to free the piston off. Has worked fine for the last 3 calipers I stripped. These were the original Honda ones as fitted to 400/4, /250/360G5/500/4 & 750/4 though.

royhall:
I use and old master cylinder and hose. Fill it with brake fluid and pump till it pops out. Comes out a bit more gently than compressed air but is a messy job with the fluid running out at the same time as the piston.

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