A8L Quattro Sedan V8-4.2L (AUX) (2001)
Hydraulic Control Assembly - Antilock Brakes: Service and Repair
Hydraulic Unit and Brake Lines
Brake fine tightening torque: 15 Nm.
1. Bolt 5 Nm
2. Cover
3. ABS solenoid valve relay
4. ABS return flow pump relay
5. ABS hydraulic unit 5.0
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Different versions, Refer to Fig. 1 and Fig. 2
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No repair work is permitted at the hydraulic unit except for replacement of both relays. Do not remove screws.
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The hydraulic unit is prevented before delivery as a replacement part.
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Removing and installing the hydraulic unit
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Disconnect Ground (GND) strap from battery
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Remove front half of front right wheel housing liner.
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Disconnect brake lines and immediately seal connections with plugs
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Bolt a new hydraulic unit into bracket -35-.
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Brake lines must be connected according to the marks on the hydraulic unit.
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Hydraulic unit/line connections/rear side, Refer to Fig. 1 and Fig. 2
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Bleed brake system.
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Carry out On Board Diagnostic (OBD), Brake System On Board Diagnostic (OBD)
6. Connector, ABS wire set
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Disengage and remove