Rear-Wheel Anti-Lock Brake System Description - Toyota Hilux Surf 1993 Owner's Manual

BR–70
REAR–WHEEL ANTI–LOCK BRAKE SYSTEM
General Description
• The Rear–Wheel Anti–Lock Brake System is a brake system which controls the wheel cylinder hydraulic
pressure of the rear wheels during sudden braking and braking on slippery road surfaces, preventing the
rear wheels from locking.
• In case a malfunction occurs, a diagnosis function and fail–safe system have been adopted for the Rear–
Wheel Anti–Lock Brake System to increase serviceability.
Components
No.
Speed Sensor
Solenoid Relay
Actuator
Deceleration Sensor
REAR ANTI–LOCK
Warning Light
ECU
BRAKE SYSTEM
LOCATION OF SYSTEM COMPONENTS
FUNCTION OF COMPONENTS
Detects the wheel speed from the rotation of the rear differential ring gear.
Supplies electric current to the solenoid valve of the actuator.
Controls the brake fluid pressure to rear brake wheel cylinders through signals from
the ECU.
Detects the vehicle deceleration rate from the deceleration of the body.
Lights up to alert the driver when trouble has occurred in the Rear–wheel Anti–Lock
Brake System.
According the wheel speed signals from the speed sensor and vehicle deceleration
signals from the deceleration sensor, it calculates acceleration, deceleration and slip
values and sends signals to the actuator to control brake fluid pressure.
– Rear–Wheel Anti–Lock Brake System
Function