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This is the short version of how you make your own bleeder for brake systems.
https://www.steelsoldiers.com/threads/tale-of-two-deuces.209189/post-2451828
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I think you could flush them out without a lot of trouble. Especially if you build yourself a "power bleeder". There would be a minor issue if there is a lot of sand or dirt inside the brake reservoir - but maybe you could replace the master cylinder only rather than all the brake lines AND...