PIT3665E
Service Bulletin Details
Public Details for: PIT3665E
This preliminary information communication advises the technician that the hydro-boost is not serviceable and will need to be replaced if the brake pedal moves or applies on its own at a full turn.
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Models from 2017
| 2017 CHEVROLET EXPRESS |
| 2017 CHEVROLET SILVERADO |
| 2017 CHEVROLET SUBURBAN |
| 2017 GMC SIERRA |
Models from 2016
| 2016 CHEVROLET EXPRESS |
| 2016 CHEVROLET SILVERADO |
| 2016 CHEVROLET SUBURBAN |
| 2016 GMC SIERRA |
Models from 2015
| 2015 CHEVROLET EXPRESS |
| 2015 CHEVROLET SILVERADO |
| 2015 CHEVROLET SUBURBAN |
| 2015 GMC SIERRA |
Models from 2014
| 2014 CHEVROLET EXPRESS |
| 2014 CHEVROLET SILVERADO |
| 2014 CHEVROLET SILVERADO 1500 |
| 2014 CHEVROLET SUBURBAN |
| 2014 GMC SAVANA |
| 2014 GMC SIERRA |
Models from 2013
| 2013 CHEVROLET EXPRESS |
| 2013 CHEVROLET SILVERADO |
| 2013 CHEVROLET SILVERADO 3500 |
| 2013 CHEVROLET SUBURBAN |
| 2013 GMC SAVANA |
| 2013 GMC SIERRA |
Models from 2012
| 2012 CHEVROLET EXPRESS |
| 2012 CHEVROLET SILVERADO |
| 2012 CHEVROLET SUBURBAN |
| 2012 GMC SAVANA |
| 2012 GMC SIERRA |
Models from 2011
| 2011 CHEVROLET EXPRESS |
| 2011 CHEVROLET SILVERADO |
| 2011 CHEVROLET SILVERADO 1500 |
| 2011 CHEVROLET SUBURBAN |
| 2011 GMC SAVANA |
| 2011 GMC SIERRA |
Models from 2010
| 2010 CHEVROLET EXPRESS |
| 2010 CHEVROLET SILVERADO |
| 2010 CHEVROLET SILVERADO 1500 |
| 2010 CHEVROLET SUBURBAN |
| 2010 GMC SAVANA |
| 2010 GMC SIERRA |
Models from 2009
| 2009 CHEVROLET EXPRESS |
| 2009 CHEVROLET SILVERADO |
| 2009 CHEVROLET SILVERADO 1500 |
| 2009 CHEVROLET SUBURBAN |
| 2009 GMC SAVANA |
| 2009 GMC SIERRA |
Models from 2008
| 2008 CHEVROLET EXPRESS |
| 2008 CHEVROLET SILVERADO |
| 2008 CHEVROLET SILVERADO 1500 |
| 2008 CHEVROLET SUBURBAN |
| 2008 GMC SAVANA |
| 2008 GMC SIERRA |
Models from 2007
| 2007 CHEVROLET EXPRESS |
| 2007 CHEVROLET SILVERADO |
| 2007 CHEVROLET SILVERADO 1500 |
| 2007 CHEVROLET SUBURBAN |
| 2007 GMC SAVANA |
| 2007 GMC SIERRA |
| 2007 HUMMER H2 |
Models from 2006
| 2006 CHEVROLET EXPRESS |
| 2006 CHEVROLET SILVERADO |
| 2006 CHEVROLET SILVERADO 1500 |
| 2006 CHEVROLET SUBURBAN |
| 2006 GMC SAVANA |
| 2006 GMC SIERRA |
| 2006 HUMMER H2 |
Models from 2005
| 2005 CHEVROLET ASTRO |
| 2005 CHEVROLET EXPRESS |
| 2005 CHEVROLET SILVERADO |
| 2005 CHEVROLET SUBURBAN |
| 2005 GMC SAFARI |
| 2005 GMC SAVANA |
| 2005 GMC SIERRA |
| 2005 HUMMER H2 |
Models from 2004
Models from 2003
Models from 2002
Models from 2001
Models from 2000
| 2000 CHEVROLET ASTRO |
| 2000 CHEVROLET EXPRESS |
| 2000 CHEVROLET SILVERADO |
| 2000 GMC SAFARI |
| 2000 GMC SAVANA |
| 2000 GMC SIERRA |
Models from 1999
| 1999 CHEVROLET ASTRO |
| 1999 CHEVROLET EXPRESS |
| 1999 CHEVROLET SILVERADO |
| 1999 GMC SAFARI |
| 1999 GMC SAVANA |
| 1999 GMC SIERRA |
Models from 1998
| 1998 CHEVROLET ASTRO |
| 1998 CHEVROLET EXPRESS |
| 1998 CHEVROLET P |
| 1998 GMC SAFARI |
| 1998 GMC SAVANA |
Bulletin No.: PIT3665E Date: Jan-2017 Subject: Brake Pedal Moves Or Self Applies At Full Turns Brand: Model: Model Year: from VIN: to from Engine: Transmission: to Cadillac Escalade 2001-2004 All All All All Chevrolet Avalanche 2002-2004 All All All All Chevrolet Tahoe 2001-2004 All All All All Chevrolet Suburban 2001-2004 All All All All Chevrolet Express 1998-2017 All All All All Chevrolet Silverado 1998-2017 All All All All Chevrolet Astro Vans 1998-2005 All All All All GMC Savana 1998-2017 All All All All GMC Sierra 1998-2017 All All All All GMC Yukon 2001-2004 All All All All GMC Safari 1998-2005 All All All All Hummer H2 2003-2007 All All All All Supersession Statement This PI was superseded to update the Models section. Please discard PIT3665D. Condition/Concern On vehicles with a Hydro-Boost System, customers may notice during full lock turns or near full lock turns that the brake pedal will move down or self apply. This can be caused by the internal dump valve of the hydro-boost not seating properly due to contamination in the steering system. The hydroboost assembly is not tolerant to certain types of contaminates that may be present in the steering system. Recommendation/Instructions The Hydro-Boost System is not serviceable and must be replaced. Important: Before replacement of the Hydro-Boost System, the entire steering system (including power steering pump, lines, cooler, and gear box) must be flushed to avoid reoccurrence. Warranty Information 1 For vehicles repaired under warranty use: Labor Operation Description Labor Time 2441730 Power Brake Booster Replacement Use Published Labor Operation Time Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION 2