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

Removal [08/2015 - ]: Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    WARNING:

    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    NOTE:

    When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2015 - 08/2019] , or refer to INITIALIZATION [08/2019 - 08/2022] , or refer to INITIALIZATION [08/2022 - ] ).

  2. DRAIN BRAKE FLUID 
    NOTE:

    Wash off brake fluid immediately if it comes into contact with a painted surface.

  3. REMOVE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY 
    1. Remove the lower No. 1 instrument panel airbag assembly (Refer to REMOVAL [08/2015 - ] ).
  4. REMOVE PUSH ROD PIN 
    1. Remove the clip and push rod pin from the brake pedal lever.
  5. REMOVE HYDRAULIC BRAKE BOOSTER ASSEMBLY 
    1. Disconnect the 3 connectors from the hydraulic brake booster assembly.
      GTY224565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Use tags or make a memo to identify the place to reconnect.
      GTY993224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a To rear wheel cylinder RH
      *b To front wheel cylinder RH
      *c To front wheel cylinder LH
      *d To rear wheel cylinder LH
    3. Using a union nut wrench, disconnect the 4 brake lines from the hydraulic brake booster assembly.
      GTY231302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 4 nuts and pull out the hydraulic brake booster assembly.
      GTY682188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE BRAKE BOOSTER GASKET 
    1. Remove the brake booster gasket from the brake master cylinder.