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Search Results   Report Date : February 10, 2010 at 01:15 AM NHTSA Action Number : RQ99008 99V131001 NHTSA Action Number : RQ99008 NHTSA Recall Campaign Number : 99V131001 Make / Models :         Model/Build Years:          AUDI / A4     1997-1999      VOLKSWAGEN / PASSAT     1998-1999 Manufacturer : VOLKSWAGEN OF AMERICA, INC Component : SERVICE BRAKES, HYDRAULIC Date Investigation Opened : June 1, 1999 Date Investigation Closed : November 14, 2000 Summary: A CONTROL VALVE IN THE VACUUM HOSE CONNECTING THE BRAKE BOOSTER TO THE INTAKE MANIFOLD CAN FAIL TO OPEN OR CLOSE FULLY AT LOW TEMPERATURE RESULTING IN INSUFFICIENT VACUUM FOR PROPER OPERATION OF THE BRAKE BOOSTER Check to Request Research. Submit below.