Anti-Lock Brake System System Description

Brake. Land Cruiser. Urj200, 202 Grj200 Vdj200
Brake Control Dynamic Control Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

  1. SYSTEM DESCRIPTION

  1. FUNCTION OF COMPONENTS

Anti-Lock Brake System -- System Description



SYSTEM DESCRIPTION
HINT:
The skid control ECU is built into the hydraulic brake booster.

  1. Multi-terrain Anti-lock Brake System (Multi-terrain ABS)
    The multi-terrain ABS detects off-road driving in sand, mud, gravel, dirt and so on based on signals from the yaw rate and acceleration sensor, the speed sensor and the ECM, and then automatically switches to the ABS control most appropriate for the current road conditions.

  2. BA (Brake Assist)
    The primary purpose of the brake assist system is to provide auxiliary brake force to assist drivers who cannot generate a brake force large enough during emergency braking, thus helping to maximize the vehicle's braking performance.

  3. EBD (Electronic Brake Force Distribution)
    EBD control utilizes the ABS and performs proper brake force distribution between the front and rear wheels in accordance with the driving conditions. When the brakes are applied while cornering, it also controls the braking forces of the right and left wheels, helping to maintain vehicle stability.


FUNCTION OF COMPONENTS

Components
Functions
Speed sensor
Detects the wheel speed of each wheel.
Hydraulic brake booster
Upon receiving a brake control signal from the skid control ECU, the hydraulic brake booster controls the hydraulic circuit and sends hydraulic pressure to each wheel. The master cylinder solenoid is removable.
Skid control ECU (Master cylinder solenoid)
Detects the vehicle condition based on signals from the sensors and sends a brake control signal to the hydraulic brake booster.
Motor relay
Supplies power to the pump motor.
Solenoid relay
Supplies power to each solenoid.
Deceleration sensor
Detects the vehicle's deceleration and sends a signal to the skid control ECU.
Master cylinder pressure sensor
Built into the master cylinder solenoid. Detects the pressure inside the master cylinder.
Accumulator pressure sensor
Built into the master cylinder solenoid. Detects the accumulator pressure.
ABS warning light
Illuminates to inform the driver that a malfunction in the ABS has occurred.
Brake warning light
  1. Illuminates to inform the driver that the parking brake is applied when the system is normal, and when the amount of brake fluid has decreased.
  2. Illuminates to inform the driver that a malfunction in the EBD has occurred.
Buzzer
  1. Built into the combination meter.
  2. Intermittently sounds to inform the driver that the accumulator has a malfunction.