Toyota 4 Runner/Hilux/Surf

1987-1998 of release

Repair and car operation


Toyota 4Раннер
+ 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-type brakes
   8.7. Wheel cylinder of back brakes
   8.8. Main cylinder of brakes
   8.9. Hoses and hydraulic actuator tubes
   8.10. Pressure regulator
   8.11. Hand brake
   8.12. Cables of the hand brake
   8.13. Vacuum amplifier of brakes
   8.14. Pumping of brakes
   8.15. Adjustment of a pedal of a brake
   8.16. Switch of a signal of braking
+ 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. Rotor of the sensor of speed
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 (is established to ABS - system), intended for increase of stability of the car in the conditions of sharp braking. Pressure in a contour of brakes is regulated depending on speed of rotation of the wheels, registered by sensors.

On cars the system of an automatic unblocking of brakes (is established to ABS - system), intended for increase of stability of the car in the conditions of sharp braking. Pressure in a contour of brakes is regulated depending on speed of rotation of the 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 speed of rotation of a wheel differs from base, the control unit opens the electromagnetic valve of an aktyuator and liquid under superfluous pressure flows down in the tank. Wheel partially растормаживается. After alignment of speed of rotation the valve is closed and pressure again accrues. Numerous repetition of such cycles stabilizes 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 signals of the control unit.

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.

Switch of a signal of braking

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

Diagnostics and repair

After engine start-up the control lamp of ABS system burns during 3 seconds, then dies away. Check the hand brake, a hydraulic actuator of brakes, sockets of sensors and an aktyuator, system conducting. If the hand brake is released, the hydraulic actuator is serviceable, all contacts and system sockets in a normal state, the ABS system is faulty and it is necessary to hand over the car in car-care center.