# 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.

- Type: Service bulletin
- NHTSA id: 10032455
- Published by NHTSA: 2010\-03\-26
- Manufacturer's number: PIT\-4935
- Manufacturer's date: 2009\-10\-01
- NHTSA component: SERVICE 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

- 2003 to 2007 CHEVROLET C4500
- 2008 CHEVROLET C4500 NA
- 2003 to 2008 CHEVROLET C5500
- 2003 to 2009 CHEVROLET C6500
- 2003 to 2007 CHEVROLET C7500
- 2009 CHEVROLET C7500
- 2008 CHEVROLET C7500NA
- 2003 to 2009 CHEVROLET C8500
- 2003 CHEVROLET CONVENTIONAL
- 2003 to 2009 CHEVROLET KODIAK
- 2007 to 2009 CHEVROLET T SERIES
- 2006 to 2007 CHEVROLET T\-SERIES
- 2004 to 2009 CHEVROLET T6500
- 2004 to 2009 CHEVROLET T7500
- 2003 to 2008 GMC C4500
- 2003 to 2008 GMC C5500
- 2003 to 2009 GMC C6500
- 2003 to 2009 GMC C7500
- 2003 GMC CONVENTIONAL
- 2004 to 2009 GMC T SERIES
- 2004 to 2009 GMC T6500
- 2004 to 2009 GMC T7500
- 2003 to 2009 GMC TOPKICK

## Recalls for the same vehicles and component

- [09V309000](/recalls/nhtsa/09V309000.md), 2009-07-29: SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR
- [07V190000](/recalls/nhtsa/07V190000.md), 2007-05-02: SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR
- [06V311000](/recalls/nhtsa/06V311000.md), 2006-08-16: SERVICE BRAKES, AIR
- [06V254000](/recalls/nhtsa/06V254000.md), 2006-07-13: PARKING BRAKE:CONVENTIONAL:AIR

## Other bulletins for the same vehicles and component

- [15\-00\-89\-004E](/bulletins/10222777.md), 2022-10-11, Service bulletin: POWER TRAIN; SUSPENSION; ENGINE AND ENGINE COOLING; SERVICE BRAKES, HYDRAULIC; STEERING. 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.
- [PIT3271J](/bulletins/10168960.md), 2019-12-09, Service bulletin: WHEELS; SERVICE BRAKES, AIR:ANTILOCK. 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\-010J](/bulletins/10138197.md), 2018-05-21, Service bulletin: ENGINE; SERVICE BRAKES; EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION. This informational bulletin provides a revision for 01\-00\-89\-010I to add the 2013 model year.
- [16\-NA\-223](/bulletins/10126062.md), 2017-12-22, Service bulletin: SERVICE BRAKES. 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\-002I](/bulletins/10114262.md), 2017-08-15, Service bulletin: PARKING BRAKE:DRIVELINE. This informational bulletin explains a normal condition for what and how the drive line can clunk.
- [PIT4907A](/bulletins/10112560.md), 2017-08-15, Service bulletin: SERVICE BRAKES. 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.
- [PIT4943C](/bulletins/10111927.md), 2017-08-15, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; FUEL SYSTEM, GASOLINE; SERVICE BRAKES, HYDRAULIC. 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\-09183A](/bulletins/10034729.md), 2011-01-08, Service bulletin: SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR; SERVICE BRAKES, HYDRAULIC; ENGINE AND ENGINE COOLING:ENGINE:DIESEL. 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\-001B](/bulletins/10033631.md), 2010-08-30, Service bulletin: SEATS; ELECTRICAL SYSTEM:HORN; STRUCTURE:BODY; SERVICE BRAKES, AIR:SUPPLY:LOW PRESSURE WARNING:SWITCH; SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR. 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
- [4042](/bulletins/10020051.md), 2006-07-14, Service bulletin: SERVICE BRAKES, HYDRAULIC. DIAGNOSTIC GUIDE FOR BOSCH HYDRAULIC BRAKE BOOSTER. \*TT

JSON: [/v1/bulletins/10032455](/v1/bulletins/10032455)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20PIT-4935&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10032455&vehicle=Service%20bulletin%20PIT-4935)