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Home >> Lexus >> 2018 >> LC 500 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System (Hydraulic) - Service Information (Coupe) >> Brake Master Cylinder >> Disassembly [03/2017 - ] >> Procedure

Disassembly [03/2017 - ]: Procedure

  1. REMOVE RESERVOIR BRACKET 
    1. Disconnect the connector.
      GTY805391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Detach the connector clamp.
    3. Detach the 2 claws and disconnect the wire harness.
    4. Remove the bolt and reservoir bracket from the brake master with stroke simulator cylinder assembly.
      GTY805390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE NO. 2 BRAKE ACTUATOR TUBE 
    1. Using a union nut wrench, disconnect the No. 2 brake actuator tube.
      GTY833895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the bolt and No. 2 brake actuator tube.
      NOTE:
      • Do not kink or damage the No. 2 brake actuator tube.
      • Do not allow any foreign matter such as dirt or dust to enter the No. 2 brake actuator tube from the connecting parts.
  3. REMOVE BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY 
    1. Detach the clip from the master cylinder bracket.
      GTY805396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the bolt and brake actuator case from the master cylinder bracket.
    3. Slide the clip and disconnect the reservoir hose from the brake master cylinder reservoir assembly and brake booster with accumulator pump assembly.
      GTY833896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the nut and brake booster with accumulator pump assembly from the brake master with stroke simulator cylinder assembly.
      GTY805376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the 2 brake booster pump bushes and 2 brake booster pump collars from the brake booster with accumulator pump assembly.
      GTY805375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the brake booster pump bush and brake booster pump collar from the brake stroke simulator bracket.
  4. REMOVE TUBE CLAMP BRACKET 
    1. Remove the bolt and tube clamp bracket from the brake booster with accumulator pump assembly.
      GTY805373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE NO. 1 BRAKE ACTUATOR BRACKET 
    1. Remove the bolt and No. 1 brake actuator bracket from the brake booster with accumulator pump assembly.
      GTY830408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE BRAKE STROKE SIMULATOR CYLINDER SUB-ASSEMBLY 
    1. Using a union nut wrench, disconnect the brake master cylinder tube from the brake stroke simulator cylinder sub-assembly.
      GTY805372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Do not kink or damage the brake master cylinder tube.
      • Do not allow any foreign matter such as dirt or dust to enter the brake master cylinder tube from the connecting parts.
    2. Remove the 2 bolts and brake stroke simulator cylinder sub-assembly from the brake stroke simulator bracket.
  7. REMOVE BRAKE MASTER CYLINDER TUBE 
    1. Using a union nut wrench, disconnect the brake master cylinder tube from the brake master cylinder sub-assembly.
      GTY833892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Do not kink or damage the brake master cylinder tube.
      • Do not allow any foreign matter such as dirt or dust to enter the brake master cylinder tube from the connecting parts.
  8. REMOVE NO. 1 BRAKE ACTUATOR TUBE 
    1. Using a union nut wrench, disconnect the No. 1 brake actuator tube from the brake master cylinder sub-assembly.
      GTY789428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Do not kink or damage the No. 1 brake actuator tube.
      • Do not allow any foreign matter such as dirt or dust to enter the No. 1 brake actuator tube from the connecting parts.
  9. REMOVE BRAKE STROKE SIMULATOR BRACKET 
    1. Remove the 3 bolts and brake stroke simulator bracket from the brake master cylinder sub-assembly.
      GTY805355Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 
    1. Mount the brake master cylinder sub-assembly in a vise.
      NOTE:

      Place aluminum plates on the vise to prevent damage to the brake master cylinder sub-assembly.

      GTY803840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a pin punch and hammer, remove the pin from the brake master cylinder reservoir assembly.
    3. Remove the brake master cylinder reservoir assembly from the brake master cylinder body.
  11. REMOVE BRAKE MASTER CYLINDER RESERVOIR FILLER CAP ASSEMBLY 
  12. REMOVE BRAKE MASTER CYLINDER RESERVOIR STRAINER 
  13. INSTALL MASTER CYLINDER RESERVOIR GROMMET 
    1. Remove the 2 master cylinder reservoir grommets from the brake master cylinder body.
      GTY811286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. REMOVE MASTER CYLINDER PUSH ROD CLEVIS 
    1. Loosen the lock nut and remove the master cylinder push rod clevis and lock nut.
      GTY811287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      Measuring the protrusion of the push rod from the master cylinder push rod clevis in advance makes it easier to adjust the brake pedal height after the brake master cylinder sub-assembly is installed.

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