A4 Sedan L4-1.8L Turbo (AWM) (2001)
Hydraulic Control Assembly - Antilock Brakes: Service Precautions
Bosch 5.3
CAUTION:
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It is not possible to repair the hydraulic control unit. If faulty, it should be replaced.
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The bolts which connect file individual components of the hydraulic control unit must not be loosened.