Toyota 4 Runner/Hilux/Surf

1987-1998 of release

Repair and operation of the car


Toyota 4ranner
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Systems of heating, ventilation
+ 5. Fuel and exhaust systems
+ 6. Transmissions
+ 7. Transmission elements
- 8. Brake system
   8.1. Specifications
   8.2. ABS system
   8.3. Blocks of disk brakes
   8.4. Brake support
   8.5. Brake disk
   8.6. Blocks of drum brakes
   8.7. Wheel cylinder of back brakes
   8.8. Main cylinder of brakes
   8.9. Hoses and tubes of a hydraulic actuator
   8.10. Pressure regulator
   8.11. Emergency brake
   8.12. Cables of the emergency brake
   8.13. Vacuum amplifier of brakes
   8.14. Pumping of brakes
   8.15. Adjustment of a pedal of a brake
   8.16. Braking signal switch
+ 9. Suspension bracket and steering
+ 10. Body
+ 11. Electric equipment
+ 12. Electroschemes





8.2. ABS system
GENERAL INFORMATION

Arrangement of units of ABS system
1, 2. Back sensor of speed
3, 5. Speed sensor rotor
4, 6. Forward sensor of speed
7. Relay
8. Aktyuator 		9. Control unit
10. DLC1 socket
11. Delay sensor
12. Control lamp

On cars the system of an automatic unblocking of brakes (ABS - system) intended for increase of stability of the car in the conditions of sharp braking is installed. Pressure in a contour of brakes is regulated depending on the speed of rotation of wheels registered by sensors.

On cars the system of an automatic unblocking of brakes (ABS - system) intended for increase of stability of the car in the conditions of sharp braking is installed. Pressure in a contour of brakes is regulated depending on the speed of rotation of wheels registered by sensors.

Control unit

It is mounted with on the right mudguard. On the block signals from the switch of a signal of braking and sensors of speed of each wheel on the basis of which pressure in a hydraulic actuator of this wheel is regulated arrive. If the speed of rotation of a wheel differs from basic, the control unit opens the electromagnetic valve of an aktyuator and liquid under excessive pressure flows down in the tank. The wheel rastormazhivatsya partially. After alignment of speed of rotation the valve is closed and pressure again increases. Numerous repetition of such cycles stabilizes the speed of rotation of all wheels and increases stability of the car. The control unit also possesses self-diagnostics function.

Aktyuator

Consists of system of the solenoidal valves working from control unit signals.

Sensors of speed of rotation of back wheels

Sensors of induction type, are mounted on each of wheels. Sinusoidal signals from the sensor arrive on the control unit.

Braking signal switch

Provides inclusion of back lamps and gets ready the control unit when braking.

Diagnostics and repair

After start-up of the engine the control lamp of ABS system burns during 3 sec., then dies away. Check the emergency brake, a hydraulic actuator of brakes, sockets of sensors and an aktyuator, conducting of system. If the emergency brake is released, the hydraulic actuator is serviceable, all contacts and sockets of system in a normal state, the ABS system is faulty and the car should be handed over in car service.