ABS scheme
- 1 - wheel speed sensor;
- 2 - wheel brake mechanism;
- 3 - hydraulic block;
- 3a - solenoid valve;
- 3b - pump;
- 4 - main brake cylinder;
- 5 - control unit;
- 6 - control lamp in the instrument cluster;
- 7 - ABS switch
The ABS consists of four wheel speed sensors, a pressure distributor, an electronic control unit, four gear rims mounted on the wheel hubs, as well as an ABS warning lamp and switch located on the instrument panel. The electronic control unit is installed under the rear seat cushion. The unit receives data on the wheel speed from the sensors and, based on this data, issues signals to the solenoid valves of the pressure distributor. The pressure distributor is installed in the engine compartment after the master brake cylinder. Four solenoid valves are installed on the distributor, from which pipes extend to the working cylinders of the brake mechanisms of the wheels. At the signal of the control unit, the valves maintain the necessary pressure in the hydraulic drive of each brake mechanism.
Warning: When carrying out electric welding work, it is necessary to disconnect the block with wires from the electronic control unit with the ignition off. When painting the body with subsequent drying in a chamber at a temperature of 85°C and above, the electronic control unit must be removed from the vehicle. Otherwise, the control unit may fail.
Removal and installation of the pressure distributor
Pressure distributor
- 1 - pressure distributor;
- 2 - relay of electromagnetic valves;
- 3 - pump relay;
- 4 - wire holder;
- 5 - cover;
- 6 - tube to the brake mechanism of the front right wheel;
- 7 - tube to the brake master cylinder;
- 8 - tube to the brake mechanism of the rear left wheel;
- 9 - tube to the brake mechanism of the rear right wheel;
- 10 - nut;
- 11 - clip;
- 12 - rubber cushion;
- 13 - tube to the brake mechanism of the front left wheel;
- 14 - wire to «mass»
1. Disconnect wire from «negative» battery terminals.
2. Drain the brake fluid from the reservoir.
3. Disconnect the pipes from the pressure distributor.
4. Remove the cover by unscrewing the fixing screw.
5. Disconnect the block with wires from the distributor.
6. Unscrew the fastening nut and disconnect the wire going to the distributor from the distributor «mass».
7. Loosen the fastening nuts and remove the pressure distributor from the bracket.
8. Install pressure distributor in reverse order. When installing, replace the fastening nuts and tighten them to a torque of 7 Nm (0.7 kgf·m). After installation, bleed the hydraulic brake system.
Removal and installation of the electronic ABS control unit
1. Disconnect wire from «negative» battery terminals.
2. Remove the rear seat cushion.
3. Disconnect the block with wires from the electronic control unit by squeezing the spring clip.
4. Unscrew the two fastening nuts and remove the electronic control unit.
5. Install the electronic control unit in reverse order. The block with wires can be connected to the control unit only when the ignition is off or the battery is disconnected.
Removal and installation of the sensor of frequency of rotation of a wheel
Installing the front speed sensor (A) and rear (b) wheels
- 1 - rotary fist;
- 2 - block with wires;
- 3 - holder;
- 4 - speed sensor;
- 5 - gasket;
- 6 - bolt;
- 7 - hub;
- 8 - ring gear;
- 9 - brake shield;
- 10 - trunnion;
- 11 - rear axle beam
1. Remove wheel.
2. When removing the right front wheel sensor, you need to remove the washer reservoir to disconnect the sensor block from the wiring harness, and the rear wheel sensors from the back of the rear seat. Disconnect the block.
3. Loosen the mounting bolt and remove the sensor.
4. Install the wheel speed sensor in reverse order.
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