Topic: 2004 CHEVROLET AVALANCHE - SERVICE BRAKES, HYDRAULIC

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Make : CHEVROLET  Model : AVALANCHE  Year : 2004 
Build Dates : 20040201 - 20040831 
NHTSA CAMPAIGN ID Number : 05V043000 
Date Owner's Notified: 20050323  Date Received by ODI: 20050208  Date Added to Databse: 20050208 
Manufacturer's Involved: GENERAL MOTORS CORP. 
Manufacturer's Responsible for the Recall: GENERAL MOTORS CORP. 
Manufacturer Campaign Number: 05006 
Component: SERVICE BRAKES, HYDRAULIC 
Potential Number Of Units Affected : 77411 
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 WILL REPLACE THE ASSEMBLY FREE OF CHARGE. THE RECALL BEGAN ON MARCH 23, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, GMC TRUCKS AT 1-866-996-9463 AND HUMMER AT 1-800-732-5493. 
Report Initiator: MFR  Vehicles Report 
Regulation Part Number:  Federal Motor Vehicle Safety Standard Number: 
Notes:
      CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATIONS AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).