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Remove Piston

There is really only one way to remove the piston from the caliper air pressure. Any other way is an exercise in futility. Using a screwdriver or other metal tool can damage the piston. Here I am using compressed air (set at a low pressure) to apply pressure to literally blow the piston out. It only takes a second. I used a bucket with paper towel to protect the piston and catch any fluids that may drain out.
With the piston out I take a first glance to see if there is any obvious damage or wear patterns that might necessitate replacing the piston. Rust on the outside edges of the piston usually means water in the brake fluid and almost certainly means that the piston is damaged enough that it may start leaking.

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