Tacoma

Toyota Tacoma 2015-2018 Brake Workshop Manual

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.
Master Cylinder
Pressure Sensor
Assembled in the brake actuator assembly, detects the master cylinder
pressure.
Pump Motor Drives the pumps inside the brake actuator assembly.
Solenoid Valves
The hydraulic circuit has 2 master cylinder cut solenoid
valves, 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
Motor Relay Supplies power to the pump motor.
Solenoid Relay Supplies power to the solenoid valves.
Speed Sensor Detects the wheel speed of each of the 4 wheels.
VSC OFF Switch Switches off the TRAC and VSC operation.
Stop Light Switch Assembly Detects the brake pedal depressing signal.
ECM
Sends the throttle position signal, accelerator pedal position
signal and engine speed signal to the skid control ECU.
Controls the engine output based on the signals received
from the skid control ECU.
Airbag Sensor
Assembly
Yaw Rate and
Acceleration
Sensor
Detects the vehicle's yaw rate.
Detects the vehicle's acceleration in the forward, rearward
and lateral directions.
Spiral cable with
sensor sub-assembly
Steering Angle
Sensor
Detects the steering direction and angle of the steering wheel.
Combination Meter
Assembly
ABS Warning
Light
Illuminates to alert the driver when the skid control ECU
detects a malfunction in the ABS.
When the rear differential lock is in the lock state, the ABS
is also prohibited and the ABS warning light turns on.*2
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.
TRAC OFF
indicator light
Illuminates to inform the driver when TRAC off mode is
selected.
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