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Home >> Toyota >> 2015 >> Corolla LE >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System - Diagnostics - Introduction (Model Code: ZRE172) >> Anti-Lock Brake System >> System Description [04/2014 - 08/2017] >> System Description [04/2014 - 08/2017]
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System Description [04/2014 - 08/2017]

  1. FUNCTION DESCRIPTION 
    1. Anti-lock Brake System (ABS)
      1. The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface.
    2. Electronic Brake Force Distribution (EBD)
      1. EBD control utilizes ABS, realizing proper brake force distribution between the front and rear wheels in accordance with the driving conditions. In addition, during braking while cornering, it also controls the brake forces of the right and left wheels, helping maintain vehicle stability.
  2. FUNCTION OF COMPONENTS 
    Component Function
    Brake Actuator Assembly Skid Control ECU Judges the vehicle driving condition based on the signals from each sensor, and sends the brake control signals to the brake actuator assembly.
    Pump Motor Drives the pumps inside the brake actuator assembly.
    Solenoid Valves
    • The hydraulic circuit has 4 pressure holding solenoid valves and 4 pressure reduction solenoid valves.
    • Change the fluid path based on the signals from the skid control ECU during the operation of the brake control system functions, in order to control the fluid pressure applied to the wheel cylinders.
    Skid Control ECU ABS Motor Relay Supplies power to the pump motor.
    ABS Solenoid Relay Supplies power to the solenoid valves.
    Speed Sensors Detect the wheel speed of each of the 4 wheels.
    Stop Light Switch Assembly Detects the brake pedal depressing signal.
    Main Body ECU (Multiplex Network Body ECU) Transmits the parking brake switch signal to the skid control ECU.
    Parking Brake Switch Assembly Detects when the parking brake lever is pulled up.
    ECM Sends the throttle position signal, accelerator pedal position signal and engine speed signal to the skid control ECU.
    Combination Meter Assembly ABS Warning Light Illuminates to alert the driver when the skid control ECU detects a malfunction in the ABS.
    Brake Warning Light
    • Illuminates to alert the driver when the skid control ECU detects a malfunction in the EBD or brake system.
    • Illuminates to alert the driver when the brake fluid level is low.
    • Illuminates to inform the driver when the parking brake is operated.
    Brake Master Cylinder Reservoir Sub-assembly Brake Fluid Level Warning Switch Detects the brake fluid level.
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