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Service bulletin PIT-3665-A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10028790
Published by NHTSA2009-05-30
Manufacturer's numberPIT-3665-A
Manufacturer's date2010-11-01
ReplacesPIT-3665B
NHTSA componentSERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES

NHTSA's summary

GENERAL MOTORS: ON ALL 1988-2009 FULL SIZE CHEVROLET/GMC PICKUPS, UTILITIES AND VANS, THE BRAKE PEDAL WILL MOVE DOWN OR SELF APPLY DURING FULL LOCK TURNS OR NEAR FULL LOCK TURNS. CHEVROLET ASTRO AND GMC SAFARI VANS; HUMMER 2 ARE INCLUDED. *PE UPDATED 5/24/11. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Brakes

Vehicles listed
CHEVROLET ASTR01992
CHEVROLET ASTRO1988 to 2005
GMC SAFARI1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
GMC SAFARI (GMC)1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 (the catalog's model; the bulletin names a series or trim of it)
HUMMER H22003, 2004, 2005, 2006, 2007

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20050332005-02-15. Brakes
05V0430002005-02-08. SERVICE BRAKES, HYDRAULIC
04V0450002004-02-04. SERVICE BRAKES, HYDRAULIC
20040372004-01-29. Brakes
19931201993-08-20. Brakes
93V1190001993-08-02. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:ROTOR
19911751991-12-23. Brakes

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
23-NA-1442023-09-15. Service bulletin. This technical bulletin provides information and a solution to a condition of Brake Pedal Moves or Self Applies at Full Turns.
PIT3665L2022-11-21. Service bulletin. 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.
15-00-89-004E2022-10-11. Service bulletin. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
PIP4723F2022-02-14. Service bulletin. This Preliminary Information communicates to the dealer the process for downloading or updating operating software for the Tire Pressure Monitor, Active Fuel Injector tester, multi media tester, PICO Scope, GR8 starting/charging tester and Vehicle Data Recorder tools, giving website address and step by step instructions to complete the update.
PIT3665J2020-08-10. Service bulletin. 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.
PIT3271J2019-12-09. Service bulletin. This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized, tested and designed for the vehicle in question and its applications. Technician should not use the information that is provided by the antilock braking system tire size selection.
PIT3665H2019-07-08. Service bulletin. 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.
PIT3665G2019-06-10. Service bulletin. 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.
00-05-22-002N2018-06-04. Service bulletin. This informational bulletin provides information for Disc Brake Warranty Service and Procedures.
01-00-89-010J2018-05-21. Service bulletin. This informational bulletin provides a revision for 01-00-89-010I to add the 2013 model year.