Recall 05V043000: Brake Hydro-Boost Unit Defect

MAKE/MODELS: MODEL/BUILD YEARS:

Chevrolet/Avalanche 2004-2005

Chevrolet/Express 2004-2005

Chevrolet/Kodiak 2004-2005

Chevrolet/Silverado 2004-2005

Chevrolet/Suburban 2004-2005

GMC/Savana 2004-2005

GMC/Sierra 2004-2005

GMC/Topkick 2004-2005

GMC/Yukon XL 2004-2005

Hummer/H2 2004-2005

MANUFACTURER: General Motors Corp.

NHTSA CAMPAIGN ID Number: 05V043000 RECALL DATE: Feb 04, 2005

COMPONENT: Service Brakes, Hydraulic

POTENTIAL NUMBER OF UNITS AFFECTED: 155465

SUMMARY:
Certain trucks, sport utility vehicles, and vans equipped with Bosch Hydro-Boost brake assemblies, the hydraulic brake booster pressure accumulator may crack and separate from the hydro-boost assembly during normal operating conditions.

CONSEQUENCE:
If a separation occurred and the hood of the vehicle were open, fragments from the accumulator could cause injury to people in the immediate area. The presence of this crack or fractured surface could allow the hydraulic fluid to leak from the accumulator circuit of the booster assembly. The loss of fluid would cause increased steering and braking effort and a crash may occur without prior warning.

REMEDY:
Dealers will test the Hydro-Boost assembly for functional operation of the two-function valve. If the Hydro-Boost assembly fails the test, dealers are to replace the assembly. The recall is expected to begin during March 2005. Owners should contact Chevrolet at 1-800-630-2438, GMC Trucks at 1-866-996-9463 and Hummer at 1-800-732-5493.

NOTES:
GM recall No. 05006. Customers can also contact The National Highway Traffic Safety Administration's Auto Safety Hotline at 1-888-327-4236.