Technical Service Bulletins

Toyota booster buzz

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Toyota booster buzz

Some Toyota vehicles may exhibit a rattle or buzz type noise coming from the driver’s instrument panel area. The noise can be duplicated when lightly accelerating and the decelerating, or when depressing the brake pedal with the shift lever in Park and then releasing the brake pedal. An updated vacuum check valve is now available to reduce this noise.

This TSB applies to 2005-2010 Avalon, 2007-2010 Camry, 2008-2009 Highlander, 2006-2009 RAV4 and 2004-2010 Sienna vehicles.


MODEL       YEAR             VALVE SHAPE         OLD P/N                    NEW P/N

Camry          2007-2010         Straight                 44730-22150             44730-20080

Highlander  2008-2009        Straight                 44730-22150             44730-20080

Avalon          2005-2010        Straight                 44730-22150             44730-20080

RAV4            2006-2009        90-degree              44730-12070             44730-14050

Sienna         2004-2010        90-degree              44730-12070             44730-14050

 Confirm that the noise is coming from the brake booster vacuum check valve.

  1. Remove the vacuum tube clip from the brake booster check valve and disconnect the tube.
  2. Remove and replace the brake booster vacuum check valve. Make sure that the new valve is fully seated into the brake booster grommet.
  3. Reconnect the vacuum tube and secure with the clip.
  4. Confirm that there are no vacuum leaks and that the noise has been eliminated.

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