A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
ABS Hydraulic Control Unit, Removing and Installing
Note: When working with brake fluid, observe the relevant safety precautions and notes; Brake system bleeding.
Special tools and equipment
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Sealing plugs from repair kit Part No. 1 HO 698 311A
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Brake pedal depressor, e.g. from VAG1813
CAUTION: Part numbers are listed here for reference only. Always check with your Parts supplier for the latest information.
Component location:
The hydraulic control unit is installed on the left side of the engine compartment.
Removing
CAUTION:
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Do not bend the brake fines.
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Before disconnecting the battery, determine the correct coding for the anti-theft radio.
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Disconnect battery Ground (GND) strap.
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Release control unit connector (arrow -1-) and disconnect harness connector (arrow-2-).
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Connect bleeder bottle to bleeder screw on left front brake caliper and open bleeder screw.
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Install brake pedal depressor between brake pedal and driver's seat. Depress brake pedal by at least 60 mm (2 3/8 inch).
Note: The brake pedal depressor must remain in position until all of the brake lines have been reconnected to the hydraulic control unit.
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Close left-front bleeder screw.
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Cover engine compartment to make sure brake fluid does not flow into it.
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Disconnect brake line connections on hydraulic control unit.
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Seal brake lines and threaded holes using plugs from repair kit, Part No. 1 HO 698 311 A.
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Remove nuts from ABS hydraulic control unit bracket.
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Remove ABS hydraulic control unit.
Installing