Removal
1. Disconnect the negative (-) terminal from the battery.
2. Apply the parking brake, jack up the front of the vehicle and securely support it on jack stands.
3. Unscrew the bolts and remove the mudguard (protection) of the engine compartment.
4. Unscrew the bolts and remove the hydraulic modulator heat shield.
5. Disconnect the feed line from the power steering pump. Place a container under the disconnected joint to collect the leaking fluid.
6. Remove the fuse box cover in the engine compartment and detach the box from the holder.
7. Remove the relay box cover in the engine compartment. Remove the engine control unit and disconnect the multi-pin connector from it.
8. Remove the engine control unit relay.
9. Disconnect the three connectors from the fuse box in the engine compartment.
10. Remove as much fluid as possible from the power steering reservoir.
11. Loosen the clamps and disconnect the two hoses from the power steering reservoir. Place a container under the disconnected joint to collect the leaking fluid.
12. Remove the power steering fluid reservoir from the mounting bracket, then unscrew the bracket mounting bolts and remove it.
13. Unscrew the mounting bolt and disconnect the multi-pin plug of the ABSAC electronic control unit wiring harness.
14. Remove as much fluid as possible from the brake system expansion tank.
15. Unscrew the union nuts and disconnect the brake pipes from the master cylinder. Place a container underneath to collect the leaking fluid and plug the pipe openings.
16. Label all six hydraulic modulator brake pipes to avoid confusion during installation. Unscrew the nuts and remove the pipes from the modulator. Plug the brake pipe and hydraulic modulator openings to prevent excessive fluid loss and dirt ingress.
17. Disconnect the hydraulic modulator from the mounting bracket and remove it from the engine compartment, being careful not to tilt it to prevent fluid from leaking out.
The installation of the hydraulic modulator is performed in the reverse order
18. Bring the fluid level in the power steering reservoir to normal.
19. Bleed the brake system (see the relevant chapter).
20. Make sure that the ABS warning light goes out after the engine starts.
21. Check the system operation in the workshop using special diagnostic equipment.
Traction Control Switch Removal
22. Make sure the ignition key is in the "Off" position, then gently pry the switch away from the instrument panel using a small screwdriver. Place cardboard or cloth under the screwdriver to avoid damaging the instrument panel.
[Material published on the website: OPELBOOK]
23. Disconnect the plug from the switch. The switch is installed in the reverse order of removal.
Front wheel speed sensor
Removal
24. Disconnect the negative (-) cable terminal from the battery.
25. Tighten the parking brake lever, jack up the front of the car, place it on jack stands and remove the front wheel.
26. Release the sensor wire from the holders on the front suspension shock absorber strut and wheel arch. Do not confuse this wire with the brake pad wear sensor wire.
27. Unscrew the mounting bolt with a socket wrench and remove the sensor from the mounting bracket (see illustrations 17.27 and 17.27a).
The ABS sensor is installed in the reverse order of removal. Before installation, apply a small amount of protective grease to the sensor housing.
28. Check the system operation in the workshop using special diagnostic equipment.
Rear wheel speed sensor
Removal
29. Disconnect the negative (-) cable terminal from the battery.
30. Tighten the parking brake lever, jack up the rear of the car, place it on jack stands and remove the rear wheel.
31. Disconnect the sensor plug and release its wire from the fasteners on the bottom.
32. Unscrew the mounting bolt and remove the ABS sensor (see illustration).
The installation of the rear wheel ABS sensor is performed in the reverse order of removal.
Before installation, apply a small amount of protective grease to the sensor body.
33. Check the system operation in the workshop using special diagnostic equipment.
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