98 Contour brake job

I am in the middle of a wheel cylinder replacement on a 98 Ford Contour, initiated after a rapd leak. I replaced the cylinder because ther was definite rust inside the cylinder and on the pistons.
Opinion: should I plan on replacing the other side as well?
This is my first time in this territory and I'm going slow and easy and following all the step by step instructions.
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I would definitely do so. They are cheap anyway. I would completely replace the brake fluid too. The rust is probably an indication of excessive moisture absorbed in it.
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every 2 years or so will extend the life of the system.
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