PIT3665J
Service Bulletin Details
Public Details for: PIT3665J
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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Bulletin No.: PIT3665J Published date: 06/26/2020 Preliminary Information PIT3665J Brake Pedal Moves or Self Applies at Full Turns Models Brand: Model: VIN: Model Years: from to Engine: Transmissions: 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 Suburban 3500HD 2016 - 2019 All All All All Chevrolet Express 1998 - 2020 All All All All Chevrolet Silverado 1998 - 2020 All All All All Chevrolet Astro Vans 1998 - 2005 All All All All GMC Savana 1998 - 2020 All All All All GMC Sierra 1998 - 2020 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All All All All Hummer H2 2003 - 2007 All All All All With Hydro-Boost Brake System Supersession Statement: This PI was superseded to update the recommendation. Please discard PIT3665H. 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. Recommendations / 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 ushed to avoid a reoccurrence. • If the vehicle has been in with the same concern within 20k miles of previous repair then it is recommended that the entire steering system (including power steering pump, lines, cooler, and gear box) be replaced. • For vehicles no longer under warranty, inform the customer that replacing the Hydro-Boost unit only, could possibly result in a shorter lifespan of the unit itself and that the customer may choose to replace all other steering system components if desired, at their own expense. Warranty Information For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. 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. © 2020 General Motors. All Rights Reserved.