S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
9. ABS return flow pump relay
10. ABS hydraulic unit
CAUTION: Apart from replacing the two relays5 repair work on the ABS hydraulic unit is not permitted. Do not loosen bolted connections.
Be aware of different versions:
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ABS FWD models
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ABS/EDL FWD models, ABS/EDL/ASR FWD models Fig. 1
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ABS/EDL AWD models 05.95; Fig. 2
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ABS/EDL AWD models 05.95; Fig. 3
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Replace complete ABS hydraulic unit, if necessary.
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The ABS hydraulic unit is supplied as a replacement part that is pre-bled.
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Removing and installing:
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Disconnect battery Ground (GND) strap.
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Seal brake lines and connections immediately with dummy plugs.
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Bolt new hydraulic control unit to bracket, item 13. Remove dummy plugs from brake line connections. Brake lines should be connected in
accordance with designations on hydraulic control unit.
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Brake line tightening torque: 15 Nm (11 ft. lbs.)
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Bleed brake system.
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Carry out high- and low pressure test.
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Carry out On board Diagnostic (OBD).
11. Screw
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15 Nm (11 ft. lbs.)
12. Washer
13. Bracket for ABS hydraulic unit
14. Bolt and washer assembly
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8 Nm (71 inch lbs.)
15. Serrated washer
16. Ground (GND) cable
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Ensure good contact
17. Hex nut
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10 Nm (7 ft. lbs.)
18. Brake line
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ABS hydraulic unit to right-front brake caliper
19. Brake line
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ABS hydraulic unit to left front brake caliper
20. Brake line
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ABS hydraulic unit to right-rear brake caliper
21. Brake line
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ABS hydraulic unit to left rear brake caliper
Fig. 1 Brake line connections at the hydraulic unit for ABS/EDL, front wheel drive and ABS/EDL/ASR front wheel drive
1. Hydraulic unit to brake master cylinder (primary piston circuit)
2. Hydraulic unit to right-rear brake caliper
3. Hydraulic unit to left-front brake caliper
4. Hydraulic unit to brake master cylinder (secondary piston circuit)
5. Hydraulic unit to left-rear brake caliper
6. Hydraulic unit to right-front brake caliper
Brake line connections: 15 Nm (11 ft. lbs.)
Note: