All Investigations » Investigation RQ99008

  Defect Investigation of Power Brake Booster Vacuum By-pass

Investigation of Power Brake Booster Vacuum By-pass

Subject: Power brake booster vacuum by-pass
Components covered:
  • Service brakes, hydraulic
Investigations Summary: This investigation was opened on Jun. 1, 1999. It was closed on Nov. 14, 2000. Note: this investigation has resulted in a vehicle safety recall.
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
Vehicles Affected by this investigation:
  • 1997 Audi A4
  • 1998 Audi A4
  • 1999 Audi A4
  • 1998 Volkswagen Passat
  • 1999 Volkswagen Passat

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