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Service bulletin PIT-4935

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 id10032455
Published by NHTSA2010-03-26
Manufacturer's numberPIT-4935
Manufacturer's date2009-10-01
NHTSA componentSERVICE BRAKES, HYDRAULIC; SERVICE BRAKES, HYDRAULIC:POWER ASSIST:HYDRAULIC; SERVICE BRAKES, HYDRAULIC:POWER ASSIST

NHTSA's summary

CHEVROLET/GMC: BRAKE ASSIST PUMP MOTOR ON AND WARNING LIGHT/CHIME. OWNERS MAY COMMENT WHEN TURNING THE STEERING WHEEL WITH THE BRAKE APPLIED THAT THE HYDRAULIC BRAKE ASSIST PUMP TURNS ON AND THE BRAKE WARNING LAMP AND CHIME MAY SOUND. MODELS CHEVROLET KODIAK, C4500-C7500, CONVENTIONAL CAB, T SERIES, TILT CAB, C6500-C7500; GMC TOPKICK, C4500-C7500, CONVENTIONAL CAB, T SERIES, TILT CAB, T6500-T7500. *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 C45002003 to 2007
CHEVROLET C4500 NA2008
CHEVROLET C55002003 to 2008
CHEVROLET C65002003 to 2009
CHEVROLET C75002003 to 2007
CHEVROLET C75002009
CHEVROLET C7500NA2008
CHEVROLET C85002003 to 2009
CHEVROLET CONVENTIONAL2003
CHEVROLET KODIAK2003 to 2009
CHEVROLET T SERIES2007, 2008, 2009
CHEVROLET T-SERIES2006, 2007
CHEVROLET T65002004 to 2009
CHEVROLET T75002004 to 2009
GMC C45002003 to 2008
GMC C55002003 to 2008
GMC C65002003 to 2009
GMC C75002003 to 2009
GMC CONVENTIONAL2003
GMC T SERIES2004, 2005, 2006, 2007, 2008, 2009
GMC T65002004 to 2009
GMC T75002004 to 2009
GMC TOPKICK2003 to 2009

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

Recalls for the same vehicles and component
09V3090002009-07-29. SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR
07V1900002007-05-02. SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR
06V3110002006-08-16. SERVICE BRAKES, AIR
06V2540002006-07-13. PARKING BRAKE:CONVENTIONAL:AIR

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
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.
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.
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.
16-NA-2232017-12-22. Service bulletin. This informational bulletin provides information on installing the correct tires for vehicles with the condition of under hard acceleration at higher speeds, the traction control light will flash. Or, they may come in for ABS or general handling/braking concerns.
99-04-20-002I2017-08-15. Service bulletin. This informational bulletin explains a normal condition for what and how the drive line can clunk.
PIT4907A2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about brake rotors on new vehicles and replacement parts from General Motors Service Parts Operations. Technician should be advised the costing should not be removed from the brake rotor it will wear off with normal brake usage. Dealer should communicate to the customer this condition is a normal operating characteristic of their vehicle.
PIT4943C2017-08-15. Service bulletin. This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp. Technician may find Diagnostic Trouble Code P0442. Technician will need to review Techlink article from May 2013 titled "Using the Evaporative Emissions System Tester" Technician will need to follow these steps to help diagnose the issue. First after the P0442 has been verified do not disturb any of the fuel system components. The technician now can use the scan tool to close the Evaporative Emissions System. If possible change the tank pressure sensor units from inch_H2O to milimeter_Hg for better resolution. Now the vehicle can be stared to monitor the tank pressure sensor output value for approximately two minutes. If the tank pressure sensor value does change, pressurize the fuel tank side of the purge solenoid with the GE 41413-A / J 41413-A and the necessary adaptors. Now add smoke and allow pressure to stabilize for 2 minutes. If smoke is allowed to pass through the purge solenoid, replace the purge solenoid. If the tank pressure sensor value does not change, then install CH-48096 adaptor between the purge line from the canister and the purge solenoid. With the Evaporative Emissions System closed, pressurize the system through the CH-48096 adaptor and allow the system to completely stabilize, by observing the Press / Vac Gauge for a minimum of 5 minutes. Now add smoke to the system with GE 41413-A / J 41413-A after system stabilization. Now inspect the purge solenoid, engine side, fuel cap, canister vent solenoid filter and any line quick connects. When the leak is unable to be located, test under a vacuum condition. his type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the Evaporative Emissions System and then observe the FTP sensor parameter for vacuum decay.
SB-09183A2011-01-08. Service bulletin. CHEVROLET GMC SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. VEHICLES EQUIPPED WITH 7.8L DIESEL ENGINE, HYDRAULIC BRAKES, AND AIR COMPRESSOR, MAY HAVE AN AIR COMPRESSOR THAT WILL NOT BUILD ENOUGH AIR PRESSURE TO OPERATE AUXILIARY AIR OPERATED SYSTEMS SUCH AS THE AIR SUSPENSION, AIR SEAT, AIR HORN, ETC. CSC LETTER WAS RECEIVED (ONLY). *PE PROGRAM BEEN REVISED TO EXPIRE 9/30/11. *PE
SB05-08-133-001B2010-08-30. Service bulletin. ISUZU/GMC/CHEVROLET: DIAGNOSTIC INFORMATION FOR INOPERATIVE AIR SEATS, AIR HORN AND/OR EXHAUST BRAKE AND RELEASE OF NEW AUXILIARY AIR COMPRESSOR RELAY AND PRESSURE SWITCH ON RPO K16 VEHICLES. *PE
40422006-07-14. Service bulletin. DIAGNOSTIC GUIDE FOR BOSCH HYDRAULIC BRAKE BOOSTER. *TT