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Home >> Toyota >> 2021 >> 4Runner Limited, RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System (Hydraulic) - Service Information >> Hydraulic Brake Booster >> Inspection [08/2015 - ] >> Procedure

Inspection [08/2015 - ]: Procedure

  1. INSPECT BRAKE BOOSTER PUMP ASSEMBLY 
    1. Apply battery voltage to the brake booster pump cables, and check the operation of the pump motor.
      GTY736209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK:

      Measurement Condition Specified Condition
      Battery positive (+) voltage → Red cable terminal Pump motor operates
      Battery negative (-) voltage → Black cable terminal
      TEXT IN ILLUSTRATION

      *1 Red Cable
      *2 Black Cable

      If the result is not as specified, replace the brake booster pump assembly.