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Home >> Toyota >> 2021 >> Mirai Limited >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brake System (Hydraulic) - Service Information >> Brake Booster Pump >> Removal [11/2020 - 11/2021] >> Caution / Notice / Hint

Caution / Notice / Hint

COMPONENTS (REMOVAL) 

Fig 1: Brake Booster Pump Removal Components [11/2020 - 11/2021] (1 Of 3)
GTY981259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Procedure Part Name Code
GTY993405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1 BRAKE MASTER CYLINDER WITH PUMP ASSEMBLY 47200L - - -
Fig 2: Brake Booster Pump Removal Components [11/2020 - 11/2021] (2 Of 3)
GTY981021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Procedure Part Name Code
GTY993405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2 NO. 2 RESERVOIR HOSE - - - -
3 NO. 1 BRAKE ACTUATOR TUBE - See step  3 - -
4 BRAKE BOOSTER WITH ACCUMULATOR PUMP ASSEMBLY - - - -
*1 BRAKE BOOSTER PUMP BUSHING *2 BRAKE ACTUATOR CASE COLLAR
Fig 3: Brake Booster Pump Removal Components [11/2020 - 11/2021] (3 Of 3)
GTY980709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Procedure Part Name Code
GTY993405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5 NO. 2 WIRE CLAMP BRACKET - See step  5 - -
6 NO. 2 BRAKE POWER SUPPLY BRACKET - See step  6 - -
7 NO. 3 BRAKE POWER SUPPLY BRACKET - See step  7 - -


The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during brake booster with accumulator pump assembly removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link
Disconnect cable from negative (-) auxiliary battery terminal Memorize steering angle neutral point Parking assist monitor system Refer to INITIALIZATION [11/2020 - 12/2022]
Panoramic view monitor system Refer to INITIALIZATION [11/2020 - 12/2022]
No. 1 Skid control ECU (brake booster with master cylinder assembly)
  1. Bleed air
  2. Perform "Calibration"
  • DTCs are stored
  • ABS warning light illuminates
  • Brake system warning light (yellow indicator) illuminates
  • Slip indicator light illuminates
  • Electronically controlled brake system disabled or malfunctions
Refer to UTILITY [11/2020 - ]
WARNING:
  • Orange wire harnesses and connectors indicate high-voltage circuits. To prevent electric shock, always follow the procedure described in the appropriate service information .
    GTY588409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Refer to PRECAUTION [11/2020 - 12/2022]

  • To prevent electric shock, wear insulated gloves when working on wire harnesses and components of the high voltage system.
    GTY588386Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT: 

When the cable is disconnected/reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.



NOTE:
  • While the auxiliary battery is connected, even if the ignition switch is off, the brake control system activates when the brake pedal is depressed or any door courtesy switch turns on. Therefore, when servicing the brake system components, do not operate the brake pedal or open/close the doors while the auxiliary battery is connected.
  • Do not carry the brake master cylinder with pump assembly by the parts shown in the illustration.
    GTY981390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a No. 1 Skid Control ECU
    *b No. 1 Reservoir Hose and No. 2 Reservoir Hose
    *c Master Cylinder Push Rod Clevis
    *d Boot
    *e Brake Master Cylinder Reservoir
    *f No. 1 Brake Actuator Tube
    *g No. 1 Wire Clamp Bracket
    *h Brake Booster with Accumulator Pump Assembly