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Brake Booster: Inspection

Fig 1: Inspecting Brake Vacuum Check Valve Assembly
G05408110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT BRAKE VACUUM CHECK VALVE ASSEMBLY 
    1. Check that there is ventilation from the booster to the engine, and no ventilation from the engine to the booster. If the results are not as specified, replace the brake booster assembly.