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Home >> Lexus >> 2019 >> LS 500 Base, RWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System - Service Information (1 Of 2) >> BRAKE ACTUATOR (w/o Vacuum Brake Booster) >> Removal [10/2020 - 10/2022] >> Procedure

Removal [10/2020 - 10/2022]: Procedure

  1. PRECAUTION 
    NOTE:

    After turning the engine switch is turned off, there may be a waiting time before disconnecting the negative (-) battery terminal.

    Refer to BEFORE DISCONNECTING BATTERY [10/2020 - 10/2022]

  2. DISCONNECT BRAKE BOOSTER PUMP CONNECTOR 
    1. With the engine switch off, disconnect the 2 brake booster pump connectors.
      GTY802937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. PERFORM ACCUMULATOR PRESSURE ZERO DOWN 
    1. Drain the brake fluid in the brake master cylinder reservoir assembly to near the MIN line.
      GTY821295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a MAX Line
      *b MIN Line
    2. Connect the Techstream to the DLC3 with the engine switch off.
    3. Check that the parking brake is applied, and turn the engine switch on (IG).
    4. Turn the Techstream on and enter the following menus: Chassis / ABS/VSC/TRAC / Utility / ECB (Electronically Controlled Brake System) Utility / Zero Down.

      HINT: 

      Using the Techstream to perform accumulator pressure zero down causes the pressurized brake fluid in the accumulator to be returned to the brake master cylinder reservoir assembly.

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      ECB Utility
    5. When the buzzer sounds, turn the engine switch off.
    6. Turn the Techstream off and disconnect the Techstream from the DLC3.
  4. DRAIN BRAKE FLUID 
    NOTE:

    If brake fluid leaks onto any painted surface, immediately wash it off.

  5. REMOVE LUGGAGE COMPARTMENT MAT SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 25

  6. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 

    Refer to PROCEDURE - Step 4

  7. REMOVE UPPER RADIATOR SUPPORT SEAL 

    Refer to PROCEDURE - Step 8

  8. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY 

    Refer to REMOVAL [10/2020 - ]

  9. REMOVE FENDER APRON BRACE SUB-ASSEMBLY LH 

    Refer to PROCEDURE - Step 41

  10. DISCONNECT WIRE HARNESS 
    1. Release the lock lever and disconnect the brake actuator connector from the brake actuator assembly.
      GTY810739Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Lock Lever Released
      Connector Disconnected
    2. Detach the 2 clips from the brake actuator bracket assembly.
  11. DISCONNECT BRAKE TUBE 
    1. Use tags or make a memo to identify the places to reconnect the brake lines.
      GTY791212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a From Brake Stroke Simulator Cylinder Sub-assembly
      *b From Brake Master Cylinder Sub-assembly
      *c To Rear Wheel Cylinder Assembly RH
      *d To Rear Wheel Cylinder Assembly LH
      *e To Front Wheel Cylinder Assembly RH
    2. Using a union nut wrench, disconnect the 10 brake tube flare nuts.
      GTY815418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Do not kink or damage the brake tube.
      • Do not allow any foreign matter such as dirt or dust to enter the brake tube from the connecting parts.
    3. Remove the bolt and disconnect the No. 2 brake actuator tube clamp.
      GTY815417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE BRAKE TUBE 
    1. Detach the claws and disconnect the 3 upper side brake tubes from the clamp.
      GTY815416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 3 lower side brake tubes with the clamp attached.
      GTY836120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Detach the claws and disconnect the 3 brake tubes from the clamp.
      GTY775005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. REMOVE BRAKE ACTUATOR WITH BRACKET 
    1. Slide the clip and disconnect the brake actuator hose from the brake master cylinder reservoir assembly.
      GTY815412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the bolt, 2 nuts and brake actuator with bracket.
      NOTE:
      • Do not kink or damage the brake tubes.
      • Do not hold the brake actuator with bracket by the connector, hose or union.
      • Do not allow any foreign matter such as dirt or dust to enter the brake lines from the connecting parts.
  14. REMOVE BRAKE ACTUATOR HOSE 
    1. Slide the clip and disconnect the brake actuator hose from the brake actuator assembly.
      GTY774838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE NO. 3 BRAKE ACTUATOR TUBE 
    1. Using a union nut wrench, disconnect the No. 3 brake actuator tube from the brake actuator assembly.
      GTY827218Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Do not kink or damage the No. 3 brake actuator tube.
      • Do not allow any foreign matter such as dirt or dust to enter the No. 3 brake actuator tube from the connecting parts.
  16. REMOVE NO. 1 BRAKE ACTUATOR WAY 
    1. Remove the 2 bolts and No. 1 brake actuator way from the brake actuator assembly.
      GTY774839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. REMOVE NO. 2 BRAKE ACTUATOR BRACKET 
    1. Remove the 3 nuts and No. 2 brake actuator bracket from the brake actuator assembly.
      GTY774840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 3 brake actuator bracket spacers from the brake actuator bracket cushion.
      GTY774841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the 3 brake actuator bracket cushions from the No. 2 brake actuator bracket.
  18. REMOVE NO. 1 BRAKE ACTUATOR BRACKET 
    1. Remove the 3 bolts and No. 1 brake actuator bracket from the brake actuator assembly.
      GTY774853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE NO. 3 BRAKE ACTUATOR BRACKET 
    1. Remove the 4 bolts and No. 3 brake actuator bracket from the body.
      GTY815410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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