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Vacuum Booster Check Valve

WARNING: This page is about a different car, the 2004 Ford Escape, 2003 Ford Escape, and 2002 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the vacuum booster hose from the power brake booster.
  2. Apply 17 in. Hg (57.3 kPa) of vacuum to the vacuum booster hose. If the vacuum does not leak off after ten minutes, the check valve is okay. Otherwise, install a new check valve.
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