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If you are careful about keeping the line from bleeding empty, you should only have to do a minimal amount of bleeding.
Keep the reservoir full, crack the lines on the old valve and then disconnect the valve. unscrew the lines to the valve and immediately hook up the new valve. Let the fluid fill up the valve before you tighten down the fittings, and then bleed the system.
If your old fluid is more than 2 years old, you might as well bleed the fronts anyway.
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