Lexus ES manuals

Lexus ES: Parking Brake System

Lexus ES (XZ10) Service Manual / Brake / Parking Brake / Parking Brake System

Precaution

PRECAUTION

NOTICE:

  • If the battery is connected, the parking brake will operate when the electric parking brake switch assembly is pulled to the lock side even if the engine switch (for Gasoline Model) or power switch (for HV Model) is off. Do not operate the electric parking brake switch assembly with the battery connected unless specified in the repair manual.
  • To prevent the electric parking brake system from operating when the shift lever is moved, make sure that the shift-linked function is disabled.
  • After the engine switch (for Gasoline Model) or power switch (for HV Model)is turned off, the parking brake ECU assembly (brake actuator assembly) and parking brake actuator assembly will continue operating for 20 seconds. If a connector is disconnected during this period, a DTC may be stored.
  • If any part is removed and installed, check for DTCs to make sure that the normal system code is output after all parts are installed.

    for HV Model: Click here

    for Gasoline Model: Click here

  • Replacing a part with a part which does not meet the same specifications may affect the performance of the brake system or lead to a hazardous situation. When replacing a part, always use a part with the same part number or equivalent.
  • When servicing the brake system, keep the parts and areas around the parts clean.
  • If the vehicle is equipped with a mobile communication system, make sure to read the related precautions in Introduction.

    Click here

  • When tilting the vehicle to perform work after parking the vehicle on a level surface, the braking force of the parking brake may not be sufficient. Make sure to pull the electric parking brake switch assembly to the lock side 2 times (2 lock operations).

    HINT:

    • The electric parking brake system determines the amount of force used to operate the parking brake according to the tilt angle detected by the deceleration sensor (airbag ECU assembly).
    • When the parking brake indicator (red) is illuminated after the electric parking brake switch assembly has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch assembly is pulled to the lock side one more time.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Parking Brake System

Symptom

Suspected Area

Link

Brake drag

Electric parking brake actuator assembly

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 Components

COMPONENTS ILLUSTRATION *1 FUEL SUCTION PLATE SUB-ASSEMBLY *2 FUEL FILTER *3 O-RING *4 FUEL MAIN VALVE ASSEMBLY (for Low Pressure) *5 FUEL MAIN VALVE ASSEMBLY (for High Pressure) - - ● Non-reusable part - -

 Left Front Wheel Speed Sensor Circuit Short to Battery (C050012)

DESCRIPTION Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control. The speed sensor detects the magnetic fields of the speed sensor rotor as it rotates and outputs a pulse signal. The frequency of the puls

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