Hydraulic Brake Booster Calibration

Hydraulic Brake Booster Calibration

Hydraulic Brake Booster Calibration

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

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:

Important: Diagnose all vehicle DTCs before proceeding HBB calibration.

1. With the scan tool, observe the "HBB Calibration Status" parameter when performing calibration. It should display "complete when calibrated, " If not, repeat HBB Calibration.
2. Transmission in Park, engine running.
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 2 through 5 (consisting of one throttle apply and three brake pedal applies) should take place within 7 seconds.