Hydraulic modulator and electronic control unit (ECU)
Removal
1. Remove the battery (see Chapter Engine electrical equipment).
2. Disconnect the two multi-pin connectors from the relay mounting block bracket.
3. Remove the cover of the mounting block, release the latter from the support bracket and move it to the side.
4. Release the wiring harnesses from the bracket.
5. Loosen the three mounting nuts and remove the relay mounting block support bracket.
6. Remove the holder from the brake pipes.
7. Remove the brake master cylinder reservoir cap and pump out all the fluid using a syringe or rubber bulb.
8. Mark the brake pipes, loosen the union nuts and disconnect the pipes from the modulator - use a socket wrench with a slotted head to prevent the splines of tightly tightened nuts from rounding off. Be prepared to collect any spilled fluid - place a rag under the union connectors. Also disconnect the brake pipes from the master cylinder (see Removal and installation the master brake cylinder). Immediately plug or tape the holes in the modulator, cylinder and tubes to prevent dirt from entering the system.
9. After releasing the lock, disconnect the special multi-pin connector at the top of the hydraulic modulator.
10. Loosen the mounting bolts/nuts, remove the modulator and ABS control unit from the support bracket and remove them from the engine compartment, - try to avoid getting brake fluid on painted body surfaces.
To minimize fluid loss, do not turn the modulator over during dismantling.
Installation
Installation is carried out in the reverse order of dismantling the components.
Finally, bleed the brake system (see Bleeding the brake system).
Wheel sensors
Replacement
The sensors are built into the wheel hubs and, if they fail, are subject to replacement together with them (see Chapter Suspension and steering).
TCS switch
Removal
1. Carefully pry the sensor off the instrument panel with a screwdriver. To avoid damaging the panel, place a piece of cardboard or a rag under the screwdriver.
Installation
Installation is carried out in the reverse order of dismantling the components.
ABS control unit
Removal
1. Remove the hydraulic modulator from the ABS electronic control unit (ECU) assembly (see above).
2. Disconnect the electrical wiring, unscrew the mounting bolts and remove the ABS ECU from the hydraulic modulator, being careful not to damage the coil holder.
3. Remove the sealing element installed between the coil holder and the control unit.
Installation
1. Place the new sealing element, install the ECU onto the hydraulic modulator assembly and tighten the new mounting bolts to the required torque in several stages (see Specifications), - do not allow the ECU to deform when installing it on the modulator. If the bolts are tight, the unit should be replaced as a whole.
If a spring plate was installed between the hydraulic modulator and the control unit during removal, it should not be reinstalled.
2. Further installation is carried out in the reverse order of dismantling the components.
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