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If the piston is badly corroded, you BIN it and grit your teeth to by a new one. Wet and drying it will seriously screw it up and give you sealing problemskettlewj wrote: if the piston is badly corroded, put it in the lathe, and clean it up with some wet and dry,
Thats similar to my experience, I soaked in diesel then applied heat with a hot air gun. Not having an airline, I used an old pair of pliers to grip the inside of the piston by forcing the handles out with a nut and bolt. A few twists and out it came.Fisambard wrote:Having soaked (my caliper) the whole thing in paraffin & WD40 and blasted with the airline it still would not budge. Left for a few hours -still no good. Got gas bottle out, warmed the caliper up for a minute, placed face down, so piston would not fly out, gave it another blast with air gun and it 'popped' nicely out onto the bench.