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HYDRAULIC BRAKE BOOSTER (HBB) DIAGNOSIS TSB Revision BASIC BRAKE SYSTEM 35A-35 STEP 1. Using scan tool MB991958, read the diagnostic CAUTION To prevent damage to scan tool MB991958, always turn the (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Carry out the troubleshooting for DTC 55 (Refer to NO : Go to Step 2. STEP 2. Check the pump motor operation. pedal depressing force feels heavy with the ignition switch (2) Turn the ignition switch to the "ON" position. YES : Go to Step 22. AC307591 AC MB991911 MB991824 MB991827 AC307591 DATA LINK CONNECTOR |