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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1027 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESHYDRAULIC BRAKE BOOSTER CALIBRATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Hydraulic Brake Booster Calibration

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Hydraulic Brake Booster Calibration
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Perform the Diagnostic System Check for DTCs prior to using this diagnostic procedure. Refer to Diagnostic System Check - Vehicle .

For vehicles under 8600 GVWR, the EBCM calibrates itself to the Brake Booster Vacuum Sensor to learn specific engine vacuum and braking characteristics of the vehicle.

If the "Power Brake Booster" activates excessively or if excessive effort of the brake pedal is consistently required, HBB calibration may be needed. To perform the HBB calibration, perform the following steps:

  1. Transmission in Park, engine running.
  2. With scan tool connected to the vehicle, check for any DTCs. If there are any DTCs current, diagnose and correct DTCs before proceeding.
  3. Apply throttle pedal to attain 3000 RPM
  4. Release throttle pedal.
  5. Apply and hold brake pedal firmly for approximately 1 second, release brake pedal. Perform this step 3 times. The entire sequence of steps 3 through 5 (consisting of one throttle apply and three brake pedal applies) should take place within 7 seconds.
  6. With the scan tool, navigate to the "data display" for the EBCM and observe the "HBB Calibration Status" parameter. It should display "complete/success" If not, repeat HBB Calibration.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.