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I have seen this topic come up several times and wanted to throw in my experience. I had a stuck caliper piston, sitting 11 years, water in the line, rusty, STUCK. I used the grease gun method and it worked pretty slick. Remove the brake line from the caliper but leave the bleeder screw tight. Remove any fittings from the end of your grease gun hose. Thread the hose directly in to the brake line hole on the caliper just a little, squeeze the grease gun handle and watch the magic happen. Any other methods?
I used an air compressor on mine.... thing sounded like a gun went off when it finally gave
I force it out with the master cylinder, why make it difficult?By the way, it is usually the brake pad that is stuck/not moving as opposed to the piston. After you remove some meat or corrosion from the brake pad, the brake works great.
With using this grease gun method to force the piston out, is that also allowing for some lube to be applied to the inner sides to allow for free movement of the piston so it won't freeze up allowing the wheel to not move? Or is that after all the position for the brake fluid?