S8 Quattro Sedan V8-4.2L (AYS) (2002)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
ABS Hydraulic Unit, Removing and Installing
Special Tools and Equipment
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Sealing plugs, repair kit 1 HO 698 311 A
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Brake pedal depressor e.g. from VAG1813
Removing
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Disconnect battery.
Disconnect connector from hydraulic unit
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Pull connector housing up enough that connector can be removed.
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Connect bleeder bottle to bleeder screw on front left brake caliper and open bleeder screw.
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Insert brake pedal depressor between brake pedal and driver's seat. Depress brake pedal at least 60 mm.
Note:
This prevents the brake fluid reservoir from emptying.
Do not remove brake pedal depressor until all brake lines have been reconnected.
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Close front left bleeder screw.
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Protect engine compartment from escaping brake fluid.
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Disconnect brake line connections at 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 hex-nuts at hydraulic control unit bracket.
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Remove hydraulic control unit.
WARNING: Brake lines must not be bent.
Installing
Installation is the reverse of removal.
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Bleed brake system.
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Carry out output Diagnostic Test Mode (DTM).