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Q: Update to brake issues on 2001 Toyota Echo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Here is the latest update, have Les Schwab replace master cyl., they blead out the system. The pressure was fine for a day or so then back to slowly loosing pressure. Took car back they went over entire break system and found nothing wrong. It was suggested that since the pressure seems to bleed away after sitting idle that it is possibly a vacuum issue where the engine is robbing the booster of pressure. So the question is where on the echo system is there a one way valve that regulates the vacuum pressure between the engine and the brake system?
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