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Vacuum Check Valve

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Working at brake booster, remove clamp and disconnect vacuum hose from vacuum check valve.
  2. Remove vacuum check valve.
  3. Check that there is ventilation from booster to engine, and no ventilation from engine to booster. See Fig 1.
  4. If any fault is found, replace vacuum check valve.
Fig 1: Checking Vacuum Check Valve
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