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Pistons and Pitting

Two things that do not go together - Pistons and Pitting. A pitted surface on the piston can cause leakage and problems. It can also potentially cause the brakes to not fully release or even lock up if bad enough. Inspect the pistons carefully for pitting.

Pitted Piston

This piston is pitted. This is most likely caused by moisture in the brake fluid and a bad dust seal allowing moisture to reach the piston.
This is a close up view of the pitting after the piston was cleaned up. The pitting is heaviest around the area where the piston sealed in the caliper. This piston probably leaked a little.

Good Piston

This piston has no pitting and can be used again.

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