Toyota Corolla

1992-1998 of release

Repair and car operation



Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Systems of cooling, heating
+ 5. Fuel, exhaust systems
+ 6. System of decrease in toxicity
+ 7. Transmissions
+ 8. Coupling and semi-axes
- 9. Brake system
   9.1. Specifications
   9.2. System of anti-blocking of brakes (ABS)
   9.3. Brake shoes of forward brakes
   9.4. Support of forward brakes
   9.5. Brake shoes of back disk brakes
   9.6. Support of back disk brakes
   9.7. Brake disk
   9.8. Brake shoes of back drum-type brakes
   9.9. Working cylinder
   9.10. Main cylinder of brake system
   9.11. Brake hoses and tubes
   9.12. Hydraulic system of brakes
   9.13. Vacuum amplifier
   9.14. Hand brake
   9.15. Ropes of the hand brake
   9.16. Brake pedal
   9.17. Switch of headlights of a stoplight
   9.18. The valve of restriction of the pressure, sensitive to car loading
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment


9.2. System of anti-blocking of brakes (ABS)

GENERAL INFORMATION

Arrangement of elements of system of anti-blocking of brakes (ABS)

1. Alarm bulb of inclusion of ABS
2. ABS system drive
3. The operating relay
4. Electronic control unit
5. Sensor rotor
6. Sensor of speed of rotation of a forward wheel
7. Sensor of speed of rotation of a back wheel
8. Sensor rotor

The system of anti-blocking of brakes (ABS) is intended for preservation of controllability of the car, its stability and maintenance of optimum decrease in speed at sharp braking in the majority of road conditions. It is carried out by tracking speed of rotation of each of wheels and adjustment of pressure of brake liquid for each of wheels. It allows to prevent blocking of wheels.

SYSTEM ELEMENTS

Drive

The drive of ABS system consists of the hydraulic pump and four electromagnetic valves. The pump creates hydraulic pressure in cavities of a drive which creates pressure in brake system. The pump and cavities are in the drive case. Electromagnetic the valve regulate pressure in brake system at ABS system inclusion. One valve is intended for each of wheels.

Sensors of speed of rotation of wheels

Sensors of speed of rotation of wheels which are available on each wheel, generate weak electric impulses at rotation of gear rotors, sending signals of various tension on the ABS electronic control unit, showing speed of rotation of wheels.

Sensors of speed of rotation of forward wheels are established on rotary fists of forward wheels, near the gear rotors established on external hinges of semi-axes.

Sensors of speed of rotation of back wheels fasten to guards of back brakes or arms of naves. Rotors of sensors are established on naves of back wheels.

ABS computer

The ABS electronic control unit is established under the dashboard and is an ABS system brain. The electronic control unit accepts and processes information received from sensors of speed of rotation of wheels, and supervises pressure in brake system, preventing blocking of wheels. The electronic control unit also constantly watches system work for tracking emergence of malfunctions.

If in system there is a malfunction, on an instrument guard the alarm bulb of ABS lights up. The malfunction code also is stored in the electronic control unit and will point to experts to area or an element of system which failed.

DIAGNOSTICS AND REPAIR

If the alarm bulb on an instrument guard lights up and does not die away at car movement, means, the ABS system demands attention. Though the special electronic tester of diagnostics of ABS is necessary for exact diagnostics of ABS system, the motorist can carry out the following preliminary checks independently before addressing in a repair truck:

      – check level of brake liquid in a tank;
      – check reliability of connections of wires;
      – check safety locks

If everything is all right, it is necessary to address to experts.